Ambigram: Mark Winter
This is off topic really but it is slightly chemical. I'd never heard of ambigrams until Punya Mishra at the Michigan State University in the USA was kind enough to send me one that he constructed using my name (as thanks for constructing WebElements). He has constructed many other beautiful ambigrams. You need to stand on your head to see exactly how clever it is. All chemists need to appreciate symmetry and this is a good example of a C₂ operation.