He proposed that a portion of a plant's circadian cycle was light-requiring, or "
photophilic," while the other portion was dark-requiring, or "scotophilia" In this model, when a short-day plant in its
photophilic phase is exposed to dark, a short-day mechanism is successfully initiated, while a long-day plant in its scotophilic phase exposed to light will have a long-day mechanism successfully induced.
Amid such calcification, the artist James Welling has forged a career of great intelligence that progresses continually in and out of abstraction; his recent boite-en-valise retrospective at Donald Young Gallery in Chicago suggested him, indeed, as an interlocutor to the
photophilic Gerhard Richter.