François Morellet
(1926–2016)

François Morellet was a French contemporary abstract painter, sculptor, and light artist. His early work prefigured minimal art and conceptual art and he played a prominent role in the development of geometrical abstract art and post-conceptual art

https://en.wikipedia.org/wiki/François_Morellet

Du jaune au violet (From Yellow to Violet)
1956
oil on canvas
110,3 x 215,8 cm
Centre Pompidou, Paris
https://www.centrepompidou.fr/en/ressources/oeuvre/c8E8b4R

 This is one of the rare paintings that François Morellet devoted to colour in the mid-1950s. The two contrasting series of concentric squares demonstrate the dual possibility of going from yellow ta violet according to the laws of colour: by warm tones (orange and red) or cold tones (green and blue). The shades are obtained through an optical blend of lines painted in the basic hues they are composed of. The artist ensured neutrality and precision through the entirely mechanical application of the lines using a paint roller.