Abstract
This article is a study of the correspondence between Forms and particulars in Plato. Its primary purpose is to determine whether they exhibit an ontological symmetry, in other words, whether there is always one where there is the other. This points to two questions, one on the existence of things that do not have correlative Forms, the other on the existence of Forms that do not have correlative things. Both questions have come up before in the scholarly literature on Plato, but the answers have not been sufficiently sensitive to the intricacies of the questions. Nor have they been adequately resourceful with what little evidence there is in the original sources. The intention here is to make up for that deficiency, not just with better answers, but also with better insight into the questions.