Lot Essay
'Eventually I found what I was looking for in the conjunction of the vertical and diagonal...this conjunction was the new form. It could be seen as a patch of colour - acting almost like a brush mark. When enlarged, these formal patches become coloured planes that could take up different positions in space' (B. Riley, quoted in exhibition catalogue, Bridget Riley Flashback, London, Hayward Gallery, 2009, p. 18).