Roman Mars on Flags, Cars, and Urban Design

Stand on a street corner in an unfamiliar city and look for the sign that tells you where you are. Chances are it was not put there for you. It was put there for the driver approaching the intersection, half a block back, going thirty miles an hour. Pedestrians get the leftovers: a sign mounted a few feet past where a walker would actually need it. Roman Mars, the host of the design podcast 99% Invisible and co-author of The 99% Invisible City, has spent nearly two decades noticing details like this. His gift is not finding hidden beauty. It is finding hidden intention, the decisions baked into curbs, currency, and car bumpers that nobody announces out loud.

That habit of noticing runs through his conversation with economist Tyler Cowen, which moves from street signs to jug handles to atomic waste warnings without ever losing its central question: who was this thing actually designed for, and what does that choice cost everyone else? Mars admits he does not have a favorite street sign. Cowen likes Switzerland's spare, color-coded system and Los Angeles's oversized ones, built big because they are built for drivers (02:43). But his answer is less interesting than his method: judge the design by who it serves, then ask who it leaves out.

Cars are the clearest case. Mars grew up in an era when you could identify a car's make and model from its silhouette alone. Today, he says, that game is basically unplayable (03:56). Part of the reason is mundane: older cars got ten miles to the gallon and carried unsafe amounts of ornamental steel, built during what Mars calls an extractive era of manufacturing that did not price in fuel costs or crash safety (04:14). Once safety regulation and efficiency standards tightened, the bold shapes got sanded down. The rest of the reason is social: manufacturers chase a statistical mean, a shape that offends the fewest buyers, and the result drifts toward sameness (04:27). When something does break the mold, like Tesla's Cybertruck, Mars is not impressed. He calls it a horrible-looking vehicle whose utility was sacrificed for a shape nobody had seen before (04:52). Distinctiveness, in his telling, is not automatically a virtue. It is a trade-off, and this one did not pay off.

The same logic explains why he is unmoved by claims that global design is making every coffee shop in Bangkok, Tokyo, and Buenos Aires look the same. He does not deny the flattening. He just thinks attentive travelers can still find the local seams in it, the strange item on a foreign McDonald's menu, the regional detail a careless eye would miss (21:22).

The Argument With Jane Jacobs

Cowen pushes Mars on a bigger question: why do almost no post-World War II American neighborhoods look as good as prewar ones, or as good as new construction in Copenhagen or Helsinki? Mars's answer is about distance and pressure. When buildings sit close together, in a dense old neighborhood, people notice each other's choices, and a kind of local accountability builds up over time. Spread buildings out, add industrial pressure to make housing cheaper and more modular, and that accountability disappears (13:09). Mars says he actually wants construction to stay a little inefficient, so individual decisions and local labor survive the squeeze toward cookie-cutter sameness.

"I don't want building to get more efficient. I want it to be inefficient in ways, because I want people to make individual decisions." — Roman Mars (13:59)

This tension between top-down control and bottom-up texture is also where Mars locates the limits of urbanist Jane Jacobs, whose writing championed neighborhoods built from the ground up, from what she called the sidewalk ballet of everyday street life. Mars calls her observations astute (17:36), but argues her worldview, taken to its extreme, leaves no room for top-down planning that actually works, and can curdle into a kind of historic-preservationist NIMBYism, opposition to new building dressed up as neighborhood protection (18:22). A functioning city, he says, needs both modes talking to each other: the close-grained local knowledge Jacobs prized, and the large coordinated moves, like Central Park, that only top-down power can pull off. Mars calls Central Park a near miracle, a stretch of the most valuable real estate on earth that New York chose, long ago, not to develop (16:27).

Reputational reversals run through the episode. The Chrysler Building, with its stainless-steel eagles and hubcap flourishes, was dismissed by modernist critics in its own era as silly filigree, arriving just as architecture was falling in love with sleekness (14:33). Decades later, it is beloved. Brutalism, the raw-concrete style that modernists favored next, inspires Mars in the abstract but worries him in practice, because the aggregate in the concrete cracks and weathers badly, turning buildings that could feel human into ones that feel oppressive, though he cites London's Barbican complex as an example that still feels extremely human and lovely (15:19). The lesson Mars draws is patient: buildings get reassessed over and over, so judgment should wait.

That same reassessment explains his read on the iPhone. The device that looked stunning on release day now looks boring to plenty of its early buyers, Cowen included. Mars says taste simply moves on, the way it did when ornament-heavy buildings gave way to sleek modern towers that people loved partly because function finally matched form.

"When you grow up in a world in which ornamentation is reserved for the lucky few and everyone else gets nothing, all of a sudden ornamentation seems offensive." — Roman Mars (22:39)

He adds a sharper observation about phones specifically: as pocket computers absorb more functions, being an actual telephone has become almost incidental to what a phone is for (23:54), which is why a minority of users are now buying deliberately "dumb" phones built to do one thing well.

What a Flag Is For

Mars is best known outside podcasting circles for a TED talk on vexillology, the study of flags, and the conversation's most concrete design advice lives here. A city flag, he argues, should carry no lettering, because a flag flies on a pole and must read the same from the front and the back; words just mirror into nonsense from one side (34:43). Chicago is his proof of concept: its four-star flag shows up on t-shirts, murals, and city vehicles, reinforcing civic pride in what Mars calls a positive feedback loop (36:03). He is less dogmatic than his talk's reputation suggests. Maryland's busy, heraldic flag and Brazil's lettered one both break his rules and still work, because they are, in his word, gorgeous enough to embrace anyway (37:32). Since the TED talk aired, something like 250 to 300 American municipalities have redesigned their flags (40:10), including Pocatello, Idaho, which Mars once called out as having the nation's worst flag and which later thanked him for the push.

The flag material connects to a bigger theme: design that works on the nervous system rather than the conscious mind. Highway signage is built oversized, Mars says, specifically to calm a brain that never evolved to process information at highway speed (33:37). Most drivers, when surveyed, guess that the dashed lines dividing highway lanes are about two feet long; they are actually ten to fifteen feet (33:51, 34:00). Ramp speed limits are often posted lower than the truly safe speed, a small deception meant to jolt drivers out of highway hypnosis before a sharper turn (32:44). Speed bumps and traffic circles work the same way in reverse, using uncertainty rather than information to force caution (29:36). Even warning signs for nuclear waste sites run into this problem at civilizational scale: planners behind one long-term nuclear waste marker project worried that no symbol, not even a simple before-and-after pictogram of a person getting sick, could reliably warn people thousands of years from now, partly because a left-to-right reading order might mean nothing to them (30:39). Proposed fixes included folk songs and genetically engineered cats that would glow near radioactive material, passing the warning down as a story rather than a sign.

Mars ends on his own management style, which turns out to rest on the same instinct that drives his design criticism: pay attention to who is actually affected by a choice. He credits his career's durability less to any single creative talent than to treating every part of running a show, funding, scheduling, editing, as equally worth his attention, and to leading the people who work for him, including longtime senior editor Delaney Hall, with deliberate kindness.

"I try to lead with kindness first... I think it's really, really important to making a thing because we make a thing that's an expression of art." — Roman Mars (44:31)

It is a fitting close for someone who has built a career convincing people to notice what was in front of them the whole time. The street sign, the dollar bill, the flag on the pole: none of it was invisible. It was just never explained.