Flowers for Lev (1970)

Sinopsis

Lev lives above the teaming New York City streets he’s grown tired of. Stuart drives a flower delivery truck that makes its noisy rounds each morning below. 
Their feud is eternal. When an ankle injury forces Lev to spew his vitriol from a long unopened window, he lays eyes on Lana:  A two-dimensional, lifelike rendering of a beautiful woman pasted atop the roof of Stuart’s delivery truck. Lev is sedated by her beauty, and upon discovering she actually exists, he pursues a correspondence with her – hosted by Stuart.