I : 8
After a sandblasted glass picture of 1925, Fugue (Kunstmuseum, Basel).
The Fugue presents a very pronounced parallel to a fundamental structure of classical music.

First, it recalls beat (as measured by a metronome) in its vertical, static order, by repeating precisely, and thus mechanically, one and the same measure defining the width, or, better, the height, of the horizontal stripes.
Second, it performs rhythm in the vicissitude of connecting and separating groups of vertical columns within a horizontal movement by changing pronunciation and speed.

As to instrumentation, it consists of three very contrasting voices, white and black on a bright red ground which, besides carrying the two first tones, participates in their vertical as well as horizontal interacting.

As a parallel to acoustic “mixture” in music, it produces, in perceptual interaction, many nuances of the three colors used.