With our all-star team from Klutz and IDEO and countless brainstorms, we came up with 162 never-before-seen contraptions that are brilliant, useful, and ridiculous all at the same time. What kinds of inventions are included? A helium-filled hide-a-bed (hop out of bed and it hides on the ceiling). A tricycle-lawnmower combo (puts wasted play energy to work). And many more.