Contain
Put one whole inside another; keep both edges; the inner one comes out whole.
Eight dolls, each inside the next.
Seen in Marcel Duchamp, Boîte-en-valise, 1935–41
Try it on your work
Make a small object and a box that holds it exactly; the object must lift out whole. Stop when it fits.
Write a short story in which a character tells a complete second story, with its own beginning and end. Stop when the outer story ends.
A group runs a short meeting inside a longer one: the inner meeting has its own chair, agenda and close, and the outer meeting picks up where it paused. Stop when the outer meeting ends.
How it has been used
Put one whole thing inside another and keep both edges: the drawing in its mount inside the frame, the booklet in its box, the story told within a story. The inner thing must be able to come out whole. The move forbids fusing: no edge is cut to make the two fit.
Where it leads
Grouped under Put different things into contact