An example of Cairo tiling. Source: Wikimedia Commons. Tiling Dual Semiregular V3-3-4-3-4 Cairo Pentagonal by R. A. Nonenmacher - Created by me. Licensed under GFDL via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Tiling_Dual_Semiregular_V3-3-4-3-4_Cairo_Pentagonal.svg#mediaviewer/File:Tiling_Dual_Semiregular_V3-3-4-3-4_Cairo_Pentagonal.svg
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