Try it
9 × 9Tap the arrow, then reverse it before the lights settle.
The interaction. Common lights stay on. Only the arrowhead changes, so each reversal remains readable.
One shared language. Permanent dots, selective light handoffs and clean outlined shells. Chalk, Carbon and Ember carry the family across sizes and themes.
Make it yours. The preview and installation use the same source. Pointer, touch and keyboard interactions share the same state model, with system reduced motion respected throughout.