Every type: 'shape' primitive in one frame. Each tile shows one kind, animates a property
that's particular to it, and labels itself.
rect, circle, ellipse, line, polygon, path (SVG)fillColor, fillAlpha, strokeColor, strokeWidthradius, width, cornerRadius tween per-framecolorSpace: 'oklch' for vivid hue sweeps that don't pass through greyanchorX: 0 trick: left-anchored progress bar grows rightward