Colour is the key. The eye is the hammer. The soul is the piano with its many chords. The artist is the hand that, by touching this or that key, sets the soul vibrating automatically. Wassily Kandinsky
This is an example of Rhythm. Your eye naturally follows the pattern of glass from the front of the picture where the space seems wide between the panels of glass to the bottom or back of the picture where the glass appears to get closer together.