Step-by-step tutorial
Step 1
We grabbed some crayons and masking tape and taped a few together in the order that my kids requested.
Step 2
They must be taped evenly so that all will touch the paper at the same time.
Final result!
My daughter (5) thought this was the perfect rainbow-making tool. My son (2) insisted this was the wrong way to color and had me remove the tape from his set. Haha! Can't please everyone, I guess.