In animation, keyframes are the drawings which are essential to define starting and ending points of any smooth transition. They are called "frames" because their position in time is measured in frames on a strip of film. A sequence of keyframes defines which movement the spectator will see, whereas the position of the keyframes on the film, video or animation defines the timing of the movement.
Extending the idea of keyframes to three dimensional space, this technique gives the “director“(architect) the possibility to guide and direct the viewer. The presentation and setting of a building in the environment has to prepare the viewer for the forthcoming. As space is entered a path with keyframes will be there to direct the audience to another condition, and as one leaves there should be a part of the space left like a movie with an open ending.

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