montage

[mɒnˈtɑːʒ,mɔ̃taʒ]
n
the art or process of composing pictures by the superimposition or juxtaposition of miscellaneous elements, such as other pictures or photographs
such a composition
a method of film editing involving the juxtaposition or partial superimposition of several shots to form a single image
a rapidly cut film sequence of this kind