Edge extraction in real time Hot milky tea in a red mug to wake her. That and one fat candle on a plate. Birthday eyes catch the flame's edges with quick little fingers. The cones themselves know only they've been hit or not. Well, that, their neighbors' moods and how busy they've all been. But the flame's weather sweeping retinal plains -- light rain spattering dark lakes -- that blazing shape is history, known only later. We catch fire deep in the net of nerves. The role of the dark in motion pictures The signature of time ablaze in the tissues Selvage Solving systems of simultaneous constraints