Invisible compositions are based on 13-limit extended just intonation - where all relationships between note pitches are “pure”. Audible versions are MOS approximations, one for each earphone. Temperaments are taken from the scale labyrinth, so as the wandering of the visitor through the speakers will be something like moving through the maze.

Another name for this set of temperaments is a Scale Tree. The same name is used for an extinct species of trees - lepidodendrons. Not that humanity ever had a chance to see or hear them live - after all, they lived 300 million years ago, but our project might just be a move towards a projection of these trees.