Transmogrifier, Time machine, Duplicator
For these three inventions you only need one thing: a cardboard box! Put it on its side and you've got a duplicator. Crawl under and you've got a transmogrifier. Climb in the top and you've got a time machine.
These 3 strips are the beginning of an adventure on each different invention. Unfortunately for Calvin, It always ends up... let's say... with more action than there is supposed to be.
