I posted this last night, and a few people told me they didn't get it. The explanation surprised them.

The document with the graphical comments and fully controllable formatting is also the source code for the program. It's actually being compiled and run.

The compiler doesn't have any special support for this particular document format.

This is real.

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XEROX PARC's Cedar did something similar, several years before: youtube.com/watch?v=z_dt7NG38V

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Merveilles

Merveilles is a community project aimed at the establishment of new ways of speaking, seeing and organizing information — A culture that seeks augmentation through the arts of engineering and design. A warm welcome to any like-minded people who feel these ideals resonate with them.