Peter Halley is an American painter who uses neon and day glo paint to create geometric, abstract paintings and prints. The composition of his works mean that blocks of colour are placed next to each other, producing visual colour illusions as the affects of placing colours alongside each other will change how they are perceived.
As much of his work uses day glo, vivid colours these make some of the less vivid pigments appear muted and dull. For instance a bright orange is placed next to a brown yellow, an emerald green next to a grey or a pale yellow next to a dark red. These all have the effects of making the brights more extreme and the darks more muted and sallow looking.