Containment not only eliminates the figure/ground duality, it also allows both figure and ground to have mutually defined meaning as content and context. Containers both separate and connect.
~
BRICKEN, William, 2021. Iconic Arithmetic Volume III: The Structure of Imaginary And Infinite Forms. Unary press. ISBN 978-1-73248-515-0 page 
,
pdf , p. 382