Spielraum

"Every act of experience, whatever it may be that is experienced in the proper sense as it comes into view, has eo ipso, necessarily, a knowledge and potential knowledge having reference to precisely this thing, namely, to something of it which has not yet come into view. This preknowledge is indeterminate as to content, or not completely determined, but it is never completely empty; and were it not already manifest, the experience would not at all be experience of this one, this particular, thing. 

Every experience has its own horizon; every experience has its core of actual and determinate cognition, its own content of immediate determinations which give themselves; but beyond this core of determinate quiddity, of the truly given as 'itself-there,' it has its own horizon. This implies that every experience refers to the possibility... of obtaining, little by little as experience continues, new determinations of the same thing... And this horizon in its indeterminateness is copresent from the beginning as a realm (Spielraum) of possibilities, as the prescription of the path to a more precise determination, in which only experience itself decides in favor of the determinate possibility it realizes as opposed to others."

- Edmund Husserl (1859 - 1938)
Experience and Judgment