This paper has three objectives. First, I argue that apprehending an installation artwork is similar to apprehending an artwork for performance: in each case, audiences must recognize a relationship between the performance or display one encounters and the parameters expressed in the underlying work. Second, I consider whether realizations are also artworks in their own right. I argue that, in both installation art and performance, a particular realization is sometimes an artwork in its own right (even as it realizes another (...) work). I offer criteria for determining when this is the case. Application of the criteria yields the verdict that performances are sometimes artworks in their own right, while displays of installation artworks rarely are. This difference, though, is merely contingent on the conventions of the respective art forms. Third, I address ontological concerns about entities that are both abstract and temporal, as many artworks are on my analysis. (shrink)