This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
... vertex. tiling vertex arrangement own created this work entirely by myself using superliminal htm Tyler br Transferred from org en to Commons by User ArmandoMartin using de php CommonsHelper at org en Original upload log page en vertex bytes no tiling vertex arrangement created this work entirely