spikes
A reach-field CA grown onto frozen substrate cells. Each box is its own group; neighbours block but never seed each other.
Substrate card
This box is a region of immutable cells. The spikes take root on its perimeter and grow outward, stopping at the next box.
Crevice partner
The gap between these two boxes is a constrained channel — spikes from both sides meet in the middle.
circle
star
hexagon
group-relative reflow
Every box here is its own group. Opening this panel grows the gap and slides the toggle below down as one piece. Once a group has settled, moving it just translates the finished shape — a jigsaw piece — instead of re-growing it, so neither counter moves.
re-seeds — shapes: 0 · toggle:0