Chuck, I remember that article. I wanted to send a letter to the editor with an observation: It doesn't make sense to optimize your optical system without also ensuring that the mounting system was stable enough. I would have suggested rigid legs, solidly anchored to the ground, and an equatorial hip joint. I thought a sketch to go with it would have been fun. Alas, I never got around to doing either. Kim -----Original Message----- Kim, a long time ago there was an article in S&T about what the human eye would be like if optimized for night-time use. The illustration was kinda creepy. If you get a huge pupil diameter, you need a larger diameter eyeball so that the retina can be appropriately curved to match it. I suppose the brain would have specialized image-processing abilities too, though.