  On the basis of passages like the one above, however, some interpreters claim that “The Origin of the Work of Art” does not seek to “uncover the essence of art,” but that is  misleading.[41] As Heidegger says, his essay does not seek to set out one “timelessly valid determination” of the essence of art which would apply retrospectively to the entire history of art, but that is only because he does not understand essences the way they have been understood from Plato to Kripke, namely, as “timelessly valid determinations” of what something  is.[42] In fact, “The Origin of the Work of Art” does attempt to uncover and communicate art’s historical “essence,” by which Heidegger means that structure which allows art to reveal itself in different ways as it unfolds in the human understanding across time. What is confusing for many readers is that this historical essence of art is not some substance underlying the different forms of art or even a fixed property that would enable us to distinguish art from non-art but, instead, an insubstantial and ever-changing “essential strife” that is built into the structure of all intelligibility (the structure whereby entities become intelligible as entities), as we will  see.[43]