Khôra

In semiotics, Khôra (also chora; Ancient Greek: χώρα) is the space that gives a place for being. The term has been used in philosophy by Plato to designate a receptacle (as a "third kind" [triton genos]; Timaeus 48e4), a space, a material substratum, or an interval. In Plato's account, khôra is described as a formless interval, alike to a non-being, in between which the "Forms" were received from the intelligible realm (where they were originally held) and were "copied", shaping into the transitory forms of the sensible realm; it "gives space" and has maternal overtones (a womb, matrix):

“Moreover, a third kind is that of the Khôra (χώρας), everlasting, not admitting destruction, granting an abode to all things having generation, itself to be apprehended with nonsensation, by a sort of bastard reckoning, hardly trustworthy; and looking toward which we dream and affirm that it is necessary that all that is be somewhere in some place and occupy some khôra; and that that which is neither on earth nor anywhere in the heaven is nothing."

— Plato, Timaeus, 52a-b

"So likewise it is right that the substance which is to be fitted to receive frequently over its whole extent the copies of all things intelligible and eternal should itself, of its own nature, be void of all the forms. Wherefore, let us not speak of her that is the Mother and Receptacle of this generated world, which is perceptible by sight and all the senses, by the name of earth or air or fire or water, or any aggregates or constituents thereof: rather, if we describe her as a Kind invisible and unshaped, all-receptive, and in some most perplexing and most baffling partaking of the intelligible, we shall describe her truly."

— Plato, Timaeus, 51a