Quine’s thesis of ontological relativity, probably the most influential of 20th century approaches to conceptual relativity, is expressed both in an epistemic as well as in a stronger metaphysical form. Quine supports an epistemic thesis when he claims that incompatible scientific theories can account equally adequately for the data available to us (his underdetermination thesis) and that “there are various defensible ways of conceiving the world”, (Quine 1992: 102). But his thesis of the indeterminacy of translation makes the stronger claim that different incompatible manuals of translation, or conceptual schemes, can account for one and the same verbal behavior and the indeterminacy resides at the level of facts rather than our knowledge, a position that leads to unavoidable ontological relativity.