With red and white light, the shadow of the object appears in the complementary color -- cyan -- and the shadows change as your angle of vision changes.

CNN: What the brain draws from: Art and neuroscience

Making use of seven shooters simultaneously, the system photographs the object while projecting various light and shadow combinations in order to determine the ware's geometry.

ENGADGET: OrcaM sphere constructs detailed, digital 3D models of wares while you wait (video)

In contrast, Yang's lensless microscope places the object close enough to the sensor that it casts a shadow.

FORBES: Magazine Article