Distinction is form

The Platonists used to say that the not-One distinguished itself from the One, but not the converse, since the One does not flee that which flees it; and at the other pole, form distinguishes itself from matter or from the ground, but not the converse, since distinction itself is form.

Gilles Deleuze, Difference and Repetition (Continuum, 2004) pp. 36-37