So obviously it is nice to have a backup puddle, not all cluttered with random bicyclists and dogs. This photo is from the same lunchtime session on November 16, 2018. It’s a few feet east of the other puddle, and if I recall, closer to the food cart. There’s a ginkgo tree nearby, obviously. This is rainwater and snowmelt, but I do remember sometimes finding this puddle on dry days, formed from standpipe water or food truck spillage.
Canon 6D Mark II
EF24-105mm/4L IS II USM
ISO 400 28mm f/5.6 1/160sec