object lesson, third dimension, doppler effect, mackerel sky, conversation piece, found object, double entendre, fourth dimension, chemical reaction, diptych, mandragora, background noise, jan van eyck, escape velocity, object recognition, soap bubble, photogram, fata morgana, opinionist, ecce homo, ouroboros, surface tension, strange attractor, crawl space, nervous system, demoiselles, double bind, kirlian, orrery, fossae, cubistic, tympanum, photoset, aesthete, uncertainty principle, traveling salesman, drypoint, dark matter, lead pencil, collective unconscious, piero della francesca, practical joke, mysterium, tycho brahe, orcus, inside out, x chromosome, tourist trap, yves tanguy, horsehead nebula, micrograph, breeding ground, focal plane, suprematism, gernsback, night terrors, foetus, playlet, fading away, nerve cell, unravelled, ragman, breughel, plutonian, mosiac, triptych, moussorgsky, mock up, nightbird, brain surgeon, visual perception, negative feedback, marriage proposal, mary stuart, modest mussorgsky, polychromatic, memling, electron microscopic, symmetries, semiabstract, present tense, pontormo, absorbingly, carnifex, ngaio marsh, kakuro, colouring, poetica, centrepiece, coloring book, pantagruel, penny dreadful, ozone hole, dirty joke, morphic, spaced out, piranesi, flesh wound, punchinello, eulenspiegel, andrea mantegna, writ large