This is the clever premise of Tantalus by Jane Jazz.
Sylvia and Tom are tantalized by the sight of each other, but they cannot reach each other because they are fifty years apart: separated by time and a wall between their studios which disintegrates to reveal each to the other, but will not let them touch or visit each other's time.
This first occurs in 1975 when Sylvia, a painter, is 25, and Tom, a sculptor, is 28, but is living in 1924.
It's a beautiful story, rather like The Time Traveller's Wife by Audrey Niffenegger or Ferney by James Long where two lovers are kept apart by time. However, in those two books, the lovers do meet through the years, but Sylvia and Tom are kept apart only to see each other through the wall. However, they discover that they can communicate by letters pushed through a hole, and their words are full of emotion.
Jane has written a Romantic story with a capital R, calling on poetry from Keats and paintings by Millais and Burne-Jones, and it's well worth visiting her blog to find out how she researched and wrote it, with the benefit of many more illustrations.
But, to find out what happens to this couple so deeply in love, you will have to read her novel, which at the moment is only available as an ebook. I can't wait for the paperback version because I'm being tantalized by the beautiful illustrations and would love one to hold in my hands and treasure it for ever!