At certain times of the morning, the sun shines through a high window in the bathroom and then through the beveled shower glass creating a prism reflection on the tile. It moves quickly so when I noticed it this morning while taking my shower, I quickly rinsed off, threw on my robe, ran downstairs to change the camera lens, then raced back upstairs to photograph. I took this photo crouching down and pointing the camera up a little and was intrigued to get a shallow depth of field on the rainbow. And the bokeh is an added bonus!
35mm lens
ISO 1600
f/1.8
1/1000
Cropped, otherwise, SOOC