black box
1. see event recorder.
2. a usually large, square room with black walls used as a space for theatrical performances.
3. a. a device or theoretical construct known or specified performance characteristics but unknown or unspecified constituents and means of operations.
3. b. something that is mysterious, especially as to function.

The black box theory of consciousness states that the mind is fully understood once the inputs and outputs are well defined, and generally couples this with a radical skepticism regarding the possibility of ever successfully describing the underlying structure, mechanism, and dynamics of the mind.

This work considers personal loss and a variety of methods used to tend pain. The black box created here can be used to guide you through your loss, or to share in a moment of another’s.
— BLACK BOX, 2015