In the late 1960’s Robert Barry abandoned painting and instead worked with invisible material such as electromagnetic energy, ultrasonic radiation and inert gases. From 1969 he showed a series of works composed of words, drawn on sheets of paper, spoken on tape, projected as slides and imprinted directly on walls. Words are essential elements in Barry’s work. They evoke in the viewer a state of contemplation and personal experience. Rather than analytical or critical language, or part of a text, these words are used individually for their capability to suggest impressions a work of art can engender. They work through insinuation and they address a multiplicity of senses that involve associations with the architectural or psychological context in which they are meant to evoke.