Agnes Martin’s restrained yet evocative paintings came from her belief that spiritual inspiration rather than intellect created great work.

In this film, which includes rare archive footage of the artist in her studio in New Mexico, her art dealer and confidant Arne Glimcher remembers Martin’s philosophical ideas about her work and her rigorous process in developing her paintings.

Tate curator Frances Morris also reveals the mathematical precision behind Martin’s abstract masterpieces, and the intense experimentation which led to her signature grids.