One From the Heart (1981)

 

The five-year romance of a window dresser and her boyfriend breaks up, as each of them finds a more interesting partner.

From memory: An expensive, audacious, but failed experiment by Francis Ford Coppola, it's visually stunning,  but narrative (and music) are simply not quite from the heart; it's all too obviously artificial.

Halliwell*: "Extraordinarily slim (for its cost) romantic fantasy which makes one wonder why, of all stories in the world, its creator chose this one. It does however boast attractive visuals."

Maltin**: "Lavishly produced but practically plotless romantic comedy...Dean Tavoularis' stylized Las Vegas set and the cinematography by Vittorio Storaro and Ronald V. Garcia are astonishing! Unfortunately, pretty images do not make a film...one of Coppola's most surreal entertainments. A must for the curious - others beware."