In 1949 Kelly meets composer John Cage and choreographer Merce Cunningham and this meeting together with Kelly’s encounter with Jean Arp’s collages that were arranged to the ‘laws of chance’ (see: http://www.moma.org/collection/object.php?object_id=37013) had a profound impact on Kelly’s work. The work on the left Deesis I is made by horizontal lines which are oil on wood and the work on the right Gate-Board is made by vertical lines which are oil on wood with string.