Brittlestars Have Eyes in Their Arms
The sea harbors strange creatures, among them the brittlestar. According to this New Scientist article, brittlestars can 'see' through their arms because of microscopic lens in their skeletons. Since I had no idea what a brittlestar looked like, I went hunting and found this photo of an orange-red brittlestar and a second, striking photograph of a spiny brittlestar. Since this is the Internet, my search also brought up a site where you can buy fossils of echinoderms online, including (naturally) brittlestars.