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A variation of 3BACKS; once diffracted through
3 lasers, now projected by one. 
In the traditional viewing situation, we see a new perspective when we change our position because our eyes cross different sections of the wavefront.
When a hologram is projected with a moving laser as seen in this piece, the image appears to move as we remain still.
As was mentioned before, each point on the film is its own entire image. In this projection, one laser beam illuminates only one "whole image" at the time - therefore to slice the laser throughout the film is to play a short animation of contiguous viewpoints - as in traditional animation, our brains interpret the images as movement.  The entire mask of light is in focus, no matter where the screen intersects it.  

laser projection