Chordal magic square

Abstract

1. The name of the design product: chord magic ruler. 2. The use of the design product: put the magic ruler on the piano keyboard, quickly understand the structural characteristics and internal relations of various chords. 3. The design points of the design product: the combination of shape, pattern and color. 4. The picture or photo that best shows the design points: front view. 5. The design for which protection is sought includes color. 6. The design product is a thin product, and the left view, right view, top view and bottom view are omitted.

Images