Most countdowns end by declaring victory. Penumbra’s ends by changing the page.
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In “Umbra Chasers,” a single clock carries the experience from the approach to totality through its brief, shifting center. C1, C2, and the final minutes aren’t just labels beside a timer: they’re states the interface moves through, so the same moment of time can feel like anticipation, arrival, and something already slipping away.
This field guide looks at the craft behind that transition: how one time source coordinates the eclipse’s changing cues, and why keeping the state in one place matters when every visual detail is meant to move together. It’s a small, precise design decision with a broader question behind it: can a webpage give you a sense of an event passing, rather than merely tell you how long until it happens?
Follow the implementation notes to see how Penumbra makes totality skip—and what the clock has to do with it.
Read the full design teardown → · Visit the live room
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