The Quadrangularis Reversum is best described as which of the following?

Quiz Options

• A chess move
• A geometric theorem
• A building in Oxford University
• A percussion instrument

Explanation

The Quadrangularis Reversum is a unique microtonal percussion instrument invented by American composer Harry Partch in 1965. It consists of bamboo resonators and marimba-like blocks arranged in an inverted formation to facilitate specific chordal movements.