Screen Shot 2015-10-19 at 16.36.24 of: Agnes Martin,
Happy Holiday 1999,
Acrylic and graphite on canvas,
support: 1525 x 1525 x 40 mm,
frame: 1545 x 1545 x 50 mm, [online] accessed 19.10.15 at: http://www.tate.org.uk/whats-on/tate-modern/exhibition/agnes-martin