Pop-up headlights exist because of a height rule and a shape that refused to obey it. In the United States, the federal standard FMVSS 108 required headlamps to sit between 22 and 54 inches above the road surface. For the low, wedge-nosed sports cars designers wanted to build through the 1970s and 1980s, a fixed headlamp mounted that high would have sat awkwardly on top of a nose built to sit as low as possible.

A retractable unit solved the contradiction: hidden and flush at rest, preserving the low, unbroken line the whole car was designed around, then rotated or raised into legal position only when actually needed. For nearly two decades this quiet mechanical compromise became one of the era's defining visual signatures.