Draw rectangle A B, 9"x2½", and divide into four equal parts.

Draw the squares C, D. Draw flap lines ¼" as shown in drawing.

Cut on full black lines.

Score and fold on dashed lines.

In one square draw and cut the opening X.

Fasten with paste, placing flaps on inside.

Cut pieces of fancy paper and attach to surfaces as shown in sketch. Teach concepts of cube, - surfaces, edges, and solid angles. Materials: Tagboard and fancy paper.