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Henry Petroski is a Professor of Civil Engineering and History at Duke University and author of Invention by Design: How Engineers Get from Thought to Thing (Harvard University Press, 1996), Engineers of Dreams: Great Bridge Builders and the Spanning of America (Alfred A. Knopf, 1995), Design Paradigms: Case Histories of Error and Judgment in Engineering (Cambridge University Press, 1994), The Pencil: A History of Design and Circumstance (A. Knopf, 1990), To Engineer Is Human: The Role of Failure in Successful Design (St. Martin's Press, 1985), and Small Things Considered: Why There Is No Perfect Design (Vintage, 2005). His book of essays Pushing the Limits: New Adventures in Engineering (Knopf, 2005) was recently published.
“When I set out to write about engineering, I wanted my books to be
accessible to all readers, engineer and non-engineer alike,” he says.
“Using everyday objects as examples of design seemed to be a potentially
very fruitful way of approaching the challenge.” In this interview
Professor Petroski discusses why any single thing has the potential to
illustrate the nature of design, but that everyday things provide the
most widely accessible examples for explaining the hows and whys of
Heller: Often the most brilliantly functional objects are the
most sublimely designed (like a safety pin or paper clip) but can
something be well designed and also be aesthetically poor, even ugly? Do
form and function really go hand in hand?
Petroski: The design ideal should be totally integrated
function and form, and to call something a well-designed object should
imply that it excels in both. The paper clip is an interesting example.
It is often cited—especially by artists, product designers, and
architects—as a model of design. When it is pictured, it is usually all
by itself, (i.e., not attached to papers) so as to best show off its
complete form. Attaching the clip to a stack of papers hides at least
half of it. Yet, it is the function of the paper clip to clip papers
together. When performing its function, the paper clip no longer
maintains its perfect form especially when the stack of papers it holds
is of a good size. In this case, the paper clip’s jaws are wedged open
by the papers, its body is twisted out of shape, and its ends dig into
the papers. It can be an ugly sight. The function is being performed but
at the expense of form. The ideal design should maintain a positive
aesthetic presence at all times.
Heller: Then are you saying that in a state of isolation a
paper clip is good design but in practice it is not? And is this why
designers have created alternative clips that are colorful and
rectilinear rather than curvilinear?
Petroski: I am saying that, when looked at strictly as
an aesthetic object, the classic Gem paper clip is almost universally
admired. When it is performing its function, however, it leaves much to
be desired from an aesthetic point of view. This could be one reason why
alternative forms for the paper clip have been developed. But mostly,
those new forms have been developed because existing paper clips fail in
some way to perform their function fully satisfactorily.
Heller: In your book Small Things Considered, you
begin with an analysis of the little tripod used in pizza boxes to
prevent the lid from sticking to the cheese. It certainly is a useful
device (and is fairly recent too). Is the measure of good design how it
solves the intended problem, or whether it provides unintended solutions
Petroski: The little tripod is called a “pizza saver” by those
who manufacture and market it. As with a paper clip, the name describes
the object’s function rather than its form. The pizza saver is a good
design because it solves a problem, that of pizza-box lids sticking to a
pizza’s cheese topping, and it does so in an elegantly economical way.
The form of the typical pizza saver leaves a lot to be desired, and much
of the admiration for the design is derived from appreciating how its
form serves its function so simply and efficiently. Whether or not the
pizza saver has unintended uses does not affect these observations. The
fact that it can be adapted for other purposes, such as being used
upside-down to hold an egg that is being decorated, may call attention
to and increase our admiration for the design, but that is not necessary
for us to appreciate it simply as a pizza saver. All designs can have
unintended uses, because everyone who uses anything is a potential
designer and re-designer.
Heller: Is the pizza saver the perfect end product for this
function? Is there another more beautiful and functional alternative?
Just because something was invented in a particular way, and adopted by
the public, does this infer that it is the Platonic ideal? Or is this
simply the “best” our talents and intelligence can produce at the time?
Petroski: I certainly would not say that the pizza savers that I
know are perfect end products. To me, their form is almost purely
functional, with little attention being given to aesthetic details.
There is certainly plenty of room for improvement of the form presumably
without having to sacrifice any function.
Heller: I've heard a term, “tyranny of the functional,” from
designers who argue that functionality (serving a specific purpose) is
the most important measure of design. Aesthetics is the after thought
that often governs the whole. Do you believe that aesthetics is merely
Petroski: No, I do not believe that. Among the largest and
most visible designs that an engineer can undertake is a long-span
bridge. Such an enormous structure begins as a form. To be sure, that
form must serve the function of carrying traffic, but that function does
not force the form. Some bridges are more aesthetically pleasing than
others because some engineers have a better aesthetic eye than others.
There is general agreement that the Golden Gate Bridge is a beautiful
structure, but as first conceived by its engineer, Joseph Strauss, the
bridge was an ugly hybrid structure that might be said to have been all
function. It was another engineer, Leon Moisseiff, who was engaged as a
consultant, who insisted that the bridge should have a more integrated
form. Some surface embellishments were contributed at the end by the
architect Irving Morrow, but the basic structural form of the bridge—as
conceived and proportioned by Moisseiff—is what makes the Golden Gate
such a striking presence.
There is currently a project ongoing to improve the appearance of
another San Francisco Bay bridge. The San Francisco–Oakland Bay Bridge
was damaged in the 1989 earthquake, since then there has been a project
to make it more functional and, in the process, make its East Bay span
more attractive. But in this case, aesthetics is coming at enormous
cost, and Bay Area residents are being asked to decide—through their
political representatives—whether they are willing to pay the price. If
there is a tyranny, it is a tyranny of economics.
Heller: History shows that product designers often need the
help of advertising and package designers to give the perfect widget its
allure. Is it possible to design something so novel that its graphic
design must be more pedestrian lest the consumer gets frightened
(remember the Edsel)?
Petroski: Ideally, a well-designed product should sell
itself, but we do not live in an ideal world. (I do not believe there is
a perfect widget. Everything can be improved upon.) Novelty can be a
deterrent to success, since the consumer does not necessarily know what
to do with the truly novel. There is a maxim attributed to the product
designer Raymond Loewy that states that designs should be the “most
advanced yet acceptable,” which is often abbreviated to the acronym,
MAYA. Redesigning something to the point where it is not recognizable as
what it is intended to be or do can be the death of a design. Even
advertising and package design may not be able to help sell a widget
that gives no hint that it is a widget.
This is not to say that novel designs must be pedestrian. There are many
fine examples of redesigned objects that are considerable aesthetic
improvements over their artifactual ancestors. Early computer mouses
were quite boxy and unattractive and probably correspondingly
uncomfortable to use by today’s standards. The Model T may be considered
a wonderful design because it was mass produced, inexpensive, and
black, but the latest automobiles seem much more attractive to just
about everyone buying a car today. But for the mass market, a car must
still resemble a car of its times.
Heller: Again in your book Small Things Considered you
compare the stainless steel Ekco to the OXO Good Grip vegetable peeler.
The former is the old standard, the latter is the hip new-comer. I've
used both and each functions well. But I've bought the OXO because it
looks good (and yes, if feels good). Which is better?
Petroski: Some readers have written to me that they think the
bare-bones Ekco is the better peeler. Mostly they argue on functional
grounds, but there is also a good deal of nostalgia that seems to affect
their judgment. Like the paper clip, the stainless-steel Ekco can be
appreciated for its minimalist design. Every part and curve seems to
serve a function in an almost effortless way. It is a very efficient
design, and it derives its aesthetic presence from that fact. (Those who
prefer the OXO might arguably say the same about it.) The OXO, on the
other hand, is strikingly modern in its look and texture. Its large,
soft handle may be a boon to arthritics, but to those who are not so
impaired obviously designed gadgets like the Oxo peeler are an aesthetic
Heller: I’ve always been struck that new and improved is the
mantra of advertising. Ever since the late 20s with the advent of
“industrial design” and “forced obsolescence” (or what Earnest Elmo
Calkins called “styling the goods”) futuristic veneers have been applied
to all products. But is it really necessary for new products to look
“modern”? Why can’t they look, well, old?
Petroski: Anything designed is subject to the fashion of the
times. Sometimes that fashion is to be “futuristic,” but sometimes it is
to be retro. In fact, both fashions can coexist. There seems always to
be enough fashion to go around and to satisfy different aesthetic senses
Heller: Paul Rand, the American graphic designer, used to say
about modernist design that it was built on geometry, and 'what could be
more perfect than geometry?" Would you say there are perfect designs
(golden mean designs) that cannot or should not be tampered with? Or is
everything fair game for new and re-design?
Petroski: I was recently sent a book on Paul Rand’s
design, and I found much in it to admire. However, I think that
everything is fair game for criticism and attempted improvement.
Geometry may be perfect, but geometers are not. I do not believe there
are any perfect designs. Because design typically involves constraints
that are inherently contradictory, choices and compromises must be made.
The mark of good design is the artful juggling of such compromises and
choices in such a way that the finished design evokes admiration not
only for its form and function, but also for its human accomplishment of
doing the best under the circumstances. I would not say that nothing
should be tampered with, for I think it is the nature of design to
tamper. Designers are forever seeking to improve and go beyond what is.
It is a human trait that is felt most strongly in creative people, which
designers certainly are.
Heller: I also believe that Rand was talking about
"timelessness," do you believe that there is such a thing as timeless
design? Or is design always of its time?
Petroski: Design can be both, I believe. There are certainly
designs that are timeless, and if that were not the case I don’t imagine
we would have museums. We call the timeless things “masterpieces” and
“classics,” and museums ranging from the Louvre to the Museum of Modern
Art are full of them. Museums, especially contemporary art museums, also
display the latest notable things. To me, there is no contradiction in
admiring (and being inspired) by timeless designs to develop things that
are also of the present time.
Heller: You have written about failure in design being endemic
to engineering. I realize the old adage "learning from mistakes" is
true, but often when design fails it is already in the marketplace. Bad
design may not kill, but it can endanger. Must there be casualties in
the quest for better design?
Petroski: Many failed designs never make it to the
marketplace. One of the obligations of the engineer is to design and
test products for safety. Those that fail the test are supposed to be
redesigned before they become available to consumers. Obviously, this is
the ideal. Designers are fallible human beings, and hence their designs
are always flawed in some way—aesthetic or functional—and sometimes
flawed objects fall through the safety net of testing and land in the
marketplace where they meet the real test. No thing cannot be improved
upon—not even the latest improved thing. This is why design is an
Ideally, as flawed as they are, designs are not dangerous. They should
be made with features that protect the user from harm. Of course, this
requires the designer to understand how a product can be used and
misused, which is not necessarily a trivial thing to do. The best design
anticipates all the ways in which something can fail, but since design
is embedded in a changing world, which it itself contributes to
changing, what might not be possible to imagine today may be likely to
Heller: Design has the power to change (and control) behavior, how is this balanced so that the result is positive?
Petroski: Design, like any other creation of the human mind,
can be used for good or evil. Fortunately, the overwhelming majority of
human beings (and hence designers) are good and well-intentioned people.
As a result, on balance, the world of design works toward positive
Heller: I agree, but what about those inventions designed for
evil. I’ve been to gun shows and some of the weaponry is beautiful in a
scary way. Designers do not have to swear to a Hippocratic Oath, but
should they swear to something that limits how design will be used?
Petroski: I doubt it would be possible to get all
designers to agree on what is good and what evil. Artists support art
for art’s sake, even though some art may offend. As artists, some
designers at least might be expected to support design for design’s
sake. Thus, we can expect that some will admire a gun for its form but
despise it for its function.
Heller: Since this is a graphic design publication, I must ask
whether you believe graphic design—typography, imagery, etc.—plays as
important a social or cultural role as the engineering feats you study?
Petroski: I certainly do believe that graphic design plays an
important social and cultural role. I see graphic design everywhere, and
the best of it enhances the environment in which we live. I greatly
admire well-designed signs that point me in the right direction,
well-designed instructions that make transparent the operation of a
product that I buy, and well-designed typography in the books,
magazines, and newspapers that I read. These things add pleasure to life
among things. Of course, poorly-designed graphics can be a blight on
the designed environment, can keep us from figuring out how to open or
assemble a new product, and can make a book or a web site difficult to
Heller: Have you experienced graphic design as adding value to any of the products you've studied?
Petroski: I have recently been looking at so-called
child-resistant packaging for drugs, and I have found that graphic
design is not consistently used to advantage. Clearly, a lot of design,
both formal and functional, went into the package in which the pain
reliever Aleve is sold. The design of its now-familiar bottle is
protected by both design and utility patents, and it is generally an
attractive and workable design. However, I think the graphic designs on
its label and top are somewhat wanting. They give inconsistent
instructions and, in my opinion, detract from the overall design.
Another pain reliever, Advil, comes in a bottle with a child-resistant
top that has excellent (wordless) graphics showing how to open it. I do
think that this provides added value to the overall design of the total
Heller: As I was reading "Small Things Considered" I was
thinking about the form I was holding—the book itself. I think we take
for granted that the book is an amazing object. It has been designed in
different ways (with various bells and whistles) but the basic
form—cover and pages - has been the same since before Guttenberg. How do
you rate the book in the pantheon of "small things" or large?
Petroski: I have written affectionately about the book in The Book on the Bookshelf,
but the focus of that essay was how we store books rather than the book
itself as a designed object. I have recently been thinking a good deal
about the design of the book itself, and I am finding it wanting,
especially in its ergonomic features. Hardcover books are heavy and have
sharp corners. Their natural configuration appears to be the closed
position, and so we have to work to keep them open. Though hardbacks
generally look better on the bookshelf, I have come to prefer paperbacks
for their lighter weight, softer shape, and greater compliance. This is
a subject that I expect to write an essay on shortly.
Heller: This is probably an unfair question, but what is the
most significant "thing" designed in the late twentieth early
twenty-first century, that has influenced, helped, hindered, whatever,
the most people, and where design is key?
Petroski: I am reluctant to single out one thing for such
distinction. To me, all well-designed things embody within them the
spirit of achievement and improvement that makes the world and our
experience in it more pleasant and enjoyable. Today’s latest design will
provide inspiration for tomorrow’s design. Long live good design.
Summary: The week’s best design stories (and general musings) to see you through the weekend.
Section: Inspiration -
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