Now McKee went to the room next to her office, sat down behind a microscope, and inserted one of the immunostained slides under the lens.

NEWYORKER: Offensive Play

In pastel, beginning around 1890, Redon produced florals that across a room appear natural but on closer inspection are glimpses into Clavaud's microscope: the botany of a different world.

WSJ: Gary Geipel: The Late Blooming of Odilon Redon