Edges are twisted at each vertex within the twist radius, giving every
side a tab and matching notch. Tiles drop in from above and resist
sliding apart. Side smoothing adds S-curves between joints for
rounder shapes. Edge and vertex rounding soften corners. Click any
label to zero it; click a value to type one in (even beyond slider
limits). Scroll to zoom; drag to pan. Export single tiles or full
grids as SVG. All settings save in the URL.