Martinmüller's complex system of combining rectangular forms follows a principle comparable to music, whereby the basic element of the quadrilateral in conjunction with its color characterization determines the coherence of the motif units.
Martinmüller chooses the rectangle as a measurable, residually joinable building block of his creations. These elements can be joined in thoughtful construction to complex orders. From logical arrangements in the horizontal, in the vertical and finally also in the diagonal, the rhythmic structure emerges - already unique, unrepeatable. And now also the color: not measurable, not definable in generally valid units. It is true that its joining is also developed in lengthy studies and experiments, but the realm of "interactions", of sounds, leading tones, intermediate tones, which emerge in the end, ultimately eludes analytical precision, but is plausible.