Do any of you out there remember the Spirograph drawing toy? The "Cycloid Drawing Machine" shown in the video is like its cooler big brother. Various wooden gear and linkage combinations are used to produce a huge array of different drawings.
The drawings are also kind of a neat way to study the output motion resulting from different gear and linkage combinations. I love that it is hand-cranked. The machine is all wood and looks to be very well made.
The Cycloid Drawing Machine is currently a Kickstarter project seeking funding. There are two funding reward levels, both of which get the backer one of these nifty machines. Here is the Kickstarter page for Cycloid Drawing Machine.