When Patrick goes over to his grandparents’ each Wednesday, he’s got plenty of things to do. One is building marble rolls out of these special blocks called Cuboros, which have holes and tracks and secret passages. The main point is, you can build ‘em as complicated as you want but you’ve got to respect gravity or the marble won’t go.
Here’s one he created with Pop’s help. They were so proud of it that he took a quick vid:
Very cool!