Composite image credits 

(Clockwise - from top left)

Incurable Brain Fungus – Torture in your Eyes
Robert Jackson
1967
UCL Art Museum #7292
© The artist

Out-Loud-Silent
Lev T Mills
1971
UCL Art Museum #7892
© The artist

Skaters
Patricia Gerrard
c.1956
UCL Art Museum #7273
© The artist's estate

Under Milkwood
Paula Rego
1954
# UCL Art Museum #5581
© The artist