Mark Grotjahn’s Untitled (Orange Butterfly Green MG 03) evokes a sense of the metaphysical. Set atop an effused abstracted ground, his forms stretch and recede in the convoluted logic of linear perspective. Excecuted in coloured pencil, the optical illusion of adjoining rainbow-toned lines becomes compounded as a feat of concentration. Each band painstakingly filled by the artist’s hand, Grotjahn’s geometric form is delineated by the embossed traces of his endeavour, imprinting his personal gestures within an emblem of perfection.