Awesome idea for an art space! SOFTlab designed a creative space for product design company Blue Marlin in The space featured a circle packed wall made of paper tubes, custom tables, custom lighting, and a flexible felt wall system.
Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.