the "Mosaic Court" at the sacred Eanna precinct dedicated to the goddess Inanna from Uruk, southern Mesopotamia, Sumerian civilization (modern Warka, southern Iraq) Uruk IV period, ca 3000 - 3100 BC This building and its columns were made of small mud bricks, which were then faced with a layer of mud plaster. Red, white, or black baked clay cones were then pushed into the mud plaster walls, creating colorful geometric patterns along the pillars and walls. by kairoinfo4u, via Flickr
These images are part of a series of remarkable patterns that bacteria form when grown in a petri dish. The colors and shading are artistic additions, but the image templates are actual colonies of tens of billions of individual microorganisms. The colony structures form as adaptive responses to laboratory-imposed stresses that mimic hostile environments faced in nature. Eshel Ben-Jacob.