On my phone, I have the simplest, zen-like game. Basically, you just try to draw a perfect circle with your finger. After each attempt, the game gives you a score. Drawing a perfect circle is much harder than it seems and takes patience and concentration.
This nineteenth-century drawing depicts the mosaic floors as they existed in St. Denis cathedral in the twelfth-century. The interlocking circle pattern on the right is from the Chapelle de la Vierge.
From the Dictionnaire raisonné de l’architecture française du XIe au XVIe siècle
Of course, I'm not completely obsessed with history. There are some cool contemporary tile artists making circle tiles too.
Here's a groovy one by another one of my tile friends, Mary Anderson of Bon Ton Tile in Minnesota:
And finally, one last tile, also by Mary Anderson:
And that brings us...