Blinds is a 4-channel voltage-controlled signal polarizer. 
Each channel consists of a polarizer circuit, also known as a four-quadrant multiplier. This circuit acts like a VCA, except that a negative control voltage will cause the output signal to be inverted, instead of being silenced.
Blinds’ outputs are daisy-chained, allowing adjacent groups of 2, 3, or all 4 channels, to be mixed together.
One can think of Blinds’ as a voltage-controlled version of Shades, the control center for all the modulation CVs used in a patch. Many other uses are possible, though. 
For example, each individual channel can be used to scale/offset a CV; and with audio rate modulation signals, each channel acts like a ring-modulator, with massive potential for drones and feedback patches.