Question 5
AI reconstruction. Reconstruction condition: the target is a solid 3 by 3 by 3 cube made from unit cubes; all unseen cells behind the visible surfaces are occupied. Choose the piece that exactly fills the visible recess. Keep the same orientation: upper faces yellow, the left-facing faces red, and the right-facing faces blue. Match unit-cube size; do not rotate, reflect, or rearrange the piece.
