Arranged literally as a treasure hunt amongst the fine prints on offer at London’s wonderful vintage print store Pure & Applied, 169 Bermondsey Street, London SE1 3UW, Ruth Marten’s elegantly lubricious work is a joyful encounter. Using 17th-19th century prints from the flea markets of NYC as starting points, Marten looks for a hidden narrative and draws it out with super-subtle collaging, rearrangement, the finest hand with pen and ink and a lightness of touch that corresponds to John Heartfield’s proclaimed “tiny spot of colour” needed to turn a work into “art of a special kind”.