Portrait of Jennie (1948)

Back in the early days, Hollywood had a nice line in fantasy films of which this is one, although the premise is so far out of left field that it doesn't bear thinking about. Briefly Joseph Cotten plays an unsuccessful artist whose latent ability comes out after he meets Jennie played by Jennifer Jones.  He doesn't seem too bothered by the fact that she is a child at their first meeting and seems to age by several years at subsequent meetings (all over the period of about a year) nor by the fact that she is probably dead. It's a completely lunatic scenario but the romanticism of the plot just carries one along.  As they say, they don't make them like this any more.