■ Working time: About 10 minutes
■ Material cost: About $2

【Materials】
· Flat elastic piece
· Masking tape made of cloth (2 kinds)
· Drawing paper
· Scissors
· Utility knife

【Steps】
① Cut the masking tape to length that goes around whole book
② Cut flat elastic to length that goes around cover of book
③ Paste flat elastic on the adhesive surface of the masking tape while stretching it
④ Attach another masking tape to ③ so that the flat elastic will not be visible
⑤ Cut the drawing paper to size 4 × 2.5 cm and then cut corners in the shape of an arrow
⑥ Cut two notches according to the width of the masking tape
⑦ Pass ④ through the incision
⑧ Prepare a masking tape cut to about 2.5 times the width of the masking tape
⑨ Align the edges of ④ so that it becomes a circle and connect with the masking tape of ⑧
Done!