Hypercard: A Framework for Writing GUI Based Apps on the Early Versions of the Mac

Hypercard was an incredible framework for writing GUI based apps on the early versions of the Mac. The user interface is just made of a stack of cards and there is always one card being displayed at once. When you interact with that, it transitions you to another card. And so we took that hypercard model and created something that we demoed at PyCon that allows you to essentially build apps on top of PyScript using these concepts.