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:
AmmannBeenker. al November UTC Transferred from org en transferred to Commons by User Liftarn using de php CommonsHelper Original uploader was Ael at org en Released into the public domain by the author en Ael Original upload log page en AmmannBeenker Ael bytes no diagram Discrete geometry Ammann Beenker