Hidden World experiments

Three approaches to one question: why does a tree’s shadow move and change length?

• Custom SVG baselineOverhead and side views with fixed scales. No runtime libraries.
• HTML ExplainerA standalone guided experiment. Includes a Review & edit mode.
• AnatomyA spatial instrument made with the Anatomy kit. Also available in a dark theme.

Each uses the same 5 m reference, Sun controls, and geometric assumptions. Learning outcomes and the comparative ranking are unmeasured.

Park encounters

Walk through the park, or open the later pond-wave experiment or bird-flocking experiment or decomposition experiment on its own. These models are separate from the shadow benchmark.