Page motion

Once per session: the grid lines draw down, the header hairline draws across and the page title lifts. Content is never hidden, so nothing waits to be read.

The old page fades out, the new one rises a few pixels and the header hairline redraws, in under 400ms, while the navigation stays put. Replay changes only the address query, so it plays without leaving this page.

Hairline diagrams draw with scroll position and undraw when you scroll back. The reader's scroll is the clock, so there is no duration or curve.

LightDark

One illustration per page appears once, by a mask wipe from left to right when about a third of it is in view. It is rendered whole, so without JavaScript it is simply there.