Behold, the optical isomers of Hollywood! Just like enantiomers in chemistry, these two forms of "Samuel Jackson" differ only in their chirality - one is Samuel- L -Jackson and the other Samuel- D -Jackson. In stereochemistry, L and D designations indicate the molecule's spatial configuration, much like how these identical images are labeled with different middle initials. The chemist's inside joke that even non-scientists can appreciate: same actor, different "optical rotation." Next up in the series: Benedict- cis -Cumberbatch and Benedict- trans -Cumberbatch.