Claim to Universality. Colour Theory Exercise 1-20 Claim to Universality. Colour Theory Exercise 1-20 Claim to Universality. Colour Theory Exercise 1-20 Claim to Universality. Colour Theory Exercise 1-20 Previous Next Claim to Universality. Colour Theory Exercise 1-20 (2012) 26x36x20cm · paper, ink and watercolour Sara Seijn Chang (Sara van der Heide) Courtesy of the artist Sara Seijn Chang (Sara van der Heide)