3D Blocks Puzzle
The demo shows a rectangle made of several pieces, plus two more (A&B). The rectangle is remade after piece C (equal in size to A+B) is removed. Then piece A is added and the rectangle is created; then piece B is added and the rectangle is re-created. While it is amusing that the three rectangles "appear" similar, it does not seem magical that the rinal rectangle once again fits inside the lovely translucent box. After all, the pieces A and B somehow replaced piece C, which cannot also fit into the box. Shouldn't piece C be lapped before A and B are put into play? That should add some magic to the presentation.