Sohan says a thing that lets light pass through (like clear glass) never makes a shadow, and only…

Why

Sohan's rule is half-built and his two examples fit it, so it feels complete. The gap: things aren't only 'lets all light through' or 'blocks all light' — many sit in between, letting SOME through and stopping some. Clear glass (transparent) passes almost all light, so barely a shadow. A wall (opaque) stops it all — dark shadow. But coloured plastic or butter paper (translucent) lets part through and holds part back, so it casts a FAINT shadow, not none and not full-dark. His rule missed the middle group. Test: hold butter paper in sunlight — you get a soft, pale shadow, proof it's neither fully see-through nor fully blocking. Sohan isn't exactly right: shadow darkness runs on a scale with how much light a thing lets pass — clear, part-clear, and solid give no, faint, and dark shadows.