Acoustic instruments.
Simple chord progressions such as C-F-G or Am-G.
Simple time signatures such as 3/4 or 4/4.
"Sharp" or natural keys such as C, D, E, G or A.
Simple scales such as pentatonic minor (blues), pentatonic major, major, melodic minor and mixolydian.
Well the artist David Hockney believed that Johannes Vermer and other used these devices such as the camera obscura to help them achieve their perceptive in achievement
