Even the subtlest change in sound configuration will result in a change in the temporal domain as well. Any engaged sonority generates its own temporality. In a long-held sonority orchestrated for a string quartet, such engagement may be called focus. Sections define themselves as a result of patterns. The vertical perspective previously created gradually allows the material to be stratified into occasionally superimposed, independently co-existing layers.
Undercurrents are superior to surface currents on the long run.