Ben Reiniger wrote on Tue, Jul 16, 2013 11:08 PM EDT:Excellent ★★★★★
This is especially useful for finding variants in the intersection of various categories. For instance, to find 3D variants where there is some kind of hexagonal component (hex prism or tetrahedral e.g.), set up the search just for 3D variants, then modify the resulting URL so that it includes "category=3D,hexagonal".