Exercise Book Stack

A marked-and-stacked pile of exercise books as one small aggregate prop 0.25x0.2m, six or seven books at slight rotations with coloured covers and a top book left open, with a height knob from a thin pile to a full class set.

风格：low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit