I remember a moment, many years ago as a baby diver, when my buddy grabbed me, signalling frantically at something on a rock. I was clutching a borrowed Nikonos camera with the smallest macro frame attached – this would photograph things that were a couple of inches across, nothing bigger. I peered at the rock but couldn’t see anything special. There were a few frilly things that might have been hydroids. There was a stripy bit which could have been a worm but didn’t quite fit. There was something black and round. I gave my buddy a puzzled glance and looked again. Then suddenly my mental search area shifted from the camera frame dimensions to the whole rock ledge and I gasped. I was looking at Continue reading →