Indeed, in “Knife in the Water” (1962) you can see elements and themes that Polanski extrapolated on in psychological thrillers such as “Repulsion” (1965), “Cul-de-sac” (1966), “Rosemary’s Baby” (1968), and “The Tenant” (1976).
Polanski was only 32 at the time he made Repulsion, and he had directed only one other film, the Polish thriller Knife in the Water (1962), which had earned him significant international acclaim and opened doors for him to make films in other countries.
As his second feature film (after "Knife in the Water"), Roman Polanski's1965 psychological thriller uncoils like a primordial poisonous snake disguised by unfathomable beauty that conceals its deadly feminine bite.
"Repulsion" was only Polanski's second feature, and his first in English, following the high acclaim of his Polish debut "Knife in the Water" (1962).
Roman Polanski's ("Rosemary's Baby"/"Repulsion "/"The Pianist") first feature-length film, Knife in the Water, does all of the following so well: its economy in style, slow boiling build-up of tension, display of primitive machoism and sexuality, emotional games, humiliation over male competition, unsettling mood, and driving psychological force.