Step 1: Preparation
construction paper (optional)
Step 2: Cover the box
Cover the box with construction paper with the color you want. Glue the paper on to cover the box completely.
Step 3: Cut out the shelves
Note: It works as long as the length of b is longer than a. Just long enough for gluing (about 1 cm). Also, make sure the length of c is not too short.
purple line - the box
black line --- cutting
blue line ---- folding
Using a cutter, cut along the black lines.
Step 4: Glue the flaps
Now glue each flaps to form each shelf.
Note: By turning the box upside down after gluing on the flaps, you can see there are two ways to use the shelf.
1.Each shelf has the color facing up
2.Each shelf has a small "fence" that can prevent objects to fall off the shelf
If you like choice 1, you may also glue the remaining flap that was completely cut off, onto the shelf without color.