http://vimeo.com/108792063
Traditional time-lapses are constrained by the idea that there is a
single universal clock. In the spirit of Einstein's relativity theory,
layer-lapses assign distinct clocks to any number of objects or regions
in a scene. Each of these clocks may start at any point in time, and
tick at any rate. The result is a visual time dilation effect known as
layer-lapse.