Okay, I admit, I did not know what "tessellation" meant. Apparently, it is a term for geometric shapes on a surface, which do not overlap, or have gaps.
Sounds good. All I know is that it's another Herschel card for the Hoard. The Mosiac Tessellation cards are serial numbered to 15, this is #6, which can be located on the card back in the upper left hand corner.