A 4-bit Calculator made in cardboard and marbleLOGIC What is it? LOGIC is a fully functional 4-bit calculator made entirely out of cardboard, hot glue and marbles. I built it with my little sisters for a science activity, it can add numbers from 0 to 15 for a maximum computable number of 30. We made it from scratch and at the time I didn't see any of the various kind of calculator that have been made using Lego, wood and other, so it's a compl
