Flip-Flap is an Open Source Mechanical Split Flap Display, AKA Solari display.
There are 2 versions. One for using an Arduino microcontroller and another for using the attiny/stepper combo.
The documentation is open source and it is going to be uploaded to Github. There is one problem though. The old website was exported to Wordpress XML and I don't know how to extract posts and images. If anyone can give a hand I would appreciate.
For more (actually less) information about this project visit: http://beachlab.org/