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A harmonic notation that uses a numbering system and single bass note to identify complete harmonies is called <span>figured bass.
</span><span>A part notated with figured bass consists of a bass line notated with notes on a musical staff plus added numbers and accidentals (or in some cases slashes added to a number) beneath the staff to indicate what intervals above the bass notes should be played</span>
A competing device is the Camera Lucida . "Camera Obscura" means "dark room", and the use of a pinhole in a window blind to form an inverted image of an outside scene on an opposite wall of a dark room.
