Hexagons and lines.
The front of the gatehouse of the 9th-century Imperial Abbey of Lorsch in Germany. It’s one of few completely preserved buildings from the Carolingian area and is a UNESCO heritage site.
And now for something completely different:
I found this but cannot find the source:
geometry, the process:
For Cee’s Black & White Photo Challenge: Any Kind of Geometric Shape. For more photos of geometric shapes, click here.