The great composer Edgar Varese (1883-1965)
compares new musical structures with crystal formationfrom his 1939 manifesto The Liberation of Sound
"The crystal is characterized by both a definite external form
and a definite internal structure. The internal structure is based
on the unit of crystal which is the smallest grouping of the atoms
that has the order and composition of the substance.
The extension of the unit into space forms the whole crystal.
But in spite of the relatively limited variety of internal structures,
the external forms of crystals are limitless."