As part of the Essential Experiments series, artist/director Stephen Dwoskin here introduces 1930's silent film Borderline. Borderline - a psychiatric condition characterised by extreme emotional instability - is an avant-garde experiment of Kenneth MacPherson that explores issues of race, gender and sexuality driven by the actual relationships between the director Kenneth Macpherson, poet Hilda Doolittle (H.D.) and novelist Bryher (Annie Winifred Ellerman). The trio formed the Pool Group, a group of artists and intellectuals that published Close Up (1927 - 1933), a magazine dedicated to independent cinema and cinema from around the world. Borderline was ahead of its time for its focus on the characters' perceptions of reality driven by their psychological state.