Wikipedia
Numena
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.