Sets as Boxes

Sets as Boxes is simple tool for visualizing finite sets as cardboard boxes.
Main features:
- Keyboard input of standard mathematical notation using { }, and digits 0-9.
- Pre-packaged common example sets (the first few natural numbers, ordinals, and some example Kuratowski pairs).
- Validation of your input and explanation of any typographical errors you made.
- 3D visualization of your input as boxes containing other boxes and balls and/or numbers.