Numena (1987) is an album by the American ambient musician Robert Rich. This is the most active solo album Rich had released by this time. It features the use of a variety of acoustic percussion instruments and just intonation for the first time in Rich’s career.
The longest and most complicated track on the album is a piece called “The Other Side of Twilight”. It consists of two movements, each with a different gamelan-inspired electronic sequence and natural ambience.
This is also the first Robert Rich album to be originally released on compact disc. In 1997 Numena was bound in a two disc set with the album Geometry.