![](http://www.davidoreilly.com/blog/wp-content/uploads/2008/07/dor_grid_300x300.gif)
While working in 3d last year I discovered this optical illusion.A large grid seen rotating at a certain speed will appear to group itself into smaller grids, spinning independently. It appears the persistence of vision effect overrides our knowledge that this is a single grid and divides it up optically.
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