Hopsa
Water travels along the paper fibers thanks to capillary action (the same way plants drink). On top of that, your child sees two colors make a third. The effect unfolds over an hour – you can keep coming back to check.
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
