Hopsa
Sunlight is a mix of all the rainbow colors, and when the disk spins faster than your eyes can follow, your brain blends the colors back together – an idea Isaac Newton explored over 350 years ago. Twisting the string and pulling at just the right moment is also great two-handed coordination practice.
The steps are in the app
Step-by-step instructions, tips and an easier and a harder version are waiting in the Hopsa app – along with 300 more ideas matched to your kids’ ages.
Coming soon to the App Store and Google Play
