1. A beam shaper module, configured to be installed on or removed from an automated luminaire, the automated luminaire producing a plurality of beams of light, the beam shaper module comprising:a housing configured to detachably couple to a light emitting face of a luminaire head of the automated luminaire;
a beam shaper comprising an array of ribbed lenses, each ribbed lens extending across the beam shaper, where each ribbed lens receives light from fewer than all of the plurality of beams of light;
one or more motors configured to rotate the beam shaper about an axis of rotation coincident with an optical axis of the automated luminaire; and
a control circuit configured to receive electrical power and control signals from the automated luminaire and, in response to the received control signals, to control rotation of the beam shaper using the one or more motors.