Materials
Marbles
Long, thick sheets of wood or toilet paper rolls and paper towel rolls
Long, thin pieces of wood
Large plastic clothespins
Plastic bowls
If you don't have the wood, simply use paper towel and toilet paper rolls. They can be used whole or they can be cut in half.
The task for this challenge is to create something for the marble to roll down and into the bowl.
This sounds simple enough, and it is, but it also requires a lot of trial and error, exploration of gravity, and creating a stable structure.