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This work is incredible. It is one of the best projection/video works I have ever seen.
A camera fixed on the concrete cube sculpture recognizes the presence of human faces within its scope. With a randomized choice it will focus on one of the bystanders and adjust its movement to his; tracking the eye movements of the viewer, a software computes the corresponding angle of view projecting onto the cube the very section of the space the sculpture is blocking from the viewers eye; thus making the cube appear transparent.