Monochrome, for a change. Those of you who are familiar with my portfolio will know that I used to post a lot of black and white photos. I've not felt inspired to do much black and white work in the last few months but here's some black and blue. The colour is 'natural', in the sense that the jellyfish in this tank at the Henry Doorly Zoo in Omaha, Nebraska, are glowing from an ultraviolet lamp in their tank. I should probably have used my 50mm f/1.4 to get a faster exposure but I was too busy watching these guys float gracefully through the water.