Modular Half-Sheet Cubes: 15

The boxes shown on this page are based on designs by Makoto Yamaguchi, which were included in a KidsToyo kit (005051A). However, I used various types of origami paper, not paper from the kit, for the boxes shown here..
 
Each of these boxes is made from 8 units: 4 units for the lid and 4 units for the base. Each unit is folded from a rectangular piece of paper measuring 15 cm by 7.5 cm -- obtained by cutting a standard 15 cm (5 7/8 in) square sheet of paper in half.