When I first saw this photo that Damsel took last week at the Botanic Garden, I thought it resembled undersea kelp (seaweed). Just for grins, I futzed with the color balance to render this illusionary kelp forest.
Roll your mouse over the picture to reveal that it is actually a large cereus cactus (one of the largest I’ve ever seen). Photo credit – Damsel (as usual). JavaScript/PHP credit – yours truly.