A Tilt Shift Fake is a way of altering a photograph by artificially faking a very narrow depth of field. Since we usually see such narrow depth of field in very close up shots, our minds interpret see these photographs as close up shots of miniature models. It helps to saturate the colors as well.
Keith Loutit has taken this one step further by combining the effect with stop motion time lapse photography. The results are very cool:
Bathtub III from Keith Loutit on Vimeo.