[French ‘placing into the abyss’]
1. The double-mirroring effect created by placing an image within an image and so on, repeating infinitely (infinite regression): for example, the album cover of Pink Floyd's Ummagumma (1969). This is also known as Droste effect.
2. A reflexive strategy where the content of a medium is the medium itself: for example, Shakespeare's Hamlet features a play within a play and Fellini's 8½ (1963) is a film within a film. See also reflexivity.
3. A formal technique in Western art of placing a small copy of an image inside a larger one.