Step 1: Materials
You need:
- post-it notes
- double sided tape or glue
- scissors (for the tape)
- and some time :D

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Maybe a few LEDs at the center of the ball? Hmm
(Some people were asking about double sided tape? I tried it, and didn't have much luck. I ended up using small amounts of Elmer's Glue to stick it all together, and I had really good luck with it. :) )
I have a suggestion about your concern Kim020289 based from experience.
Put double-sided tape to both surfaces you re going to stick together. You can have good reinforcement when you joined 2 adhesives together :-D
I hope this will help
<3
On the site lifted a subject concerning colors, it is necessary to consider such type also. Only it Russian, whether I do not know it is possible to allocate here