Space.

Space is a natural fit for a dark screen: most of the frame is black sky, and the bright part can be placed exactly where we want it. In these designs that is the centre strip, so the folded cover shows the nebula or the astronaut, not the empty edges.

Several also use the hinge itself — a zip opening onto a galaxy, a hand reaching across the fold — so they work best on the inner display held in landscape.

Free download · one 2892×2034 master; iOS crops both screens.