This painting of ethnobotanist Richard Evans Schultes demonstrating a blowgun in the Nash Lecture Hall of Harvard's Botanical Museum was painted in 1994 by artist Hannah Barrett. It comes across, to me, as a delightful blending of comic book art with that tradition of 16th-century "man of science in his study" portraiture. Plus lots of tiny, little details packed in here to mull over. As Dr. Hypercube (who sent me the link) says:

Ethnobotanical explorer in lab coat? Check. Blowgun, darts and quiver? Check. Little potted cactus ($100 says Lophophora williamsii)? Check. I'm curious as to what molecule is diagrammed on the chalkboard...