* BROADCAST-- This class will be presented to students in a classroom at the convention site and simultaneously broadcast to an off-site audience on the web. This is a tessellation in the sense of a tessellated pavement rather than the more normal origami sense of a tessellation. This is in fact an action model. Rotating one square will automatically rotate all of the others. In folding terms the folding sequence is straightforward and does not have anything other than basic valley and mountain folds. The model can be made from any "square" number of units - 4, 9, 16, 25, …etc but for sake of time we will aim for just 4 units in the class. We will start from squares of paper but the modules and joining units are not folded directly from squares and therefore attendees will need to have some means of cutting paper.