A platonistic ontology of this sort is, from the point of view of a strictly physicalistic conceptual scheme, as much a myth as that physicalistic conceptual scheme itself is for phenomenalism.
This thesis makes a thorough analysis of Plato's concept of Idea by referring to many important Plato's dialogues, with studying some other concepts, such as nous, noesis, auto, etc.
While it's true that they frequently wrote to one another and spent a great deal of time together in their home, these hidden letters reveal that the correspondence between Kahlo and Trotsky, it was strictly platonic.
There can be a certain interest in thinking together about the classical influence within Picasso's late period, or the idea of justice in Platos' The Laws or the influence of Plotinus on early Renaissance thought.