Abstract Thursday: "Crop and rotate"

Things got messy here today, with the old stair carpet being lifted to reveal the disintegrated remains of old underlay and adhesive. Much hoovering later, what was left on the steps made some nicely surreal patterns. So for this week's theme, I've cropped in, from above, on three steps. And as to "rotate"... well, it's a spiral staircase, and that's what they do! :D