Walking into Richard Hawkins’s exhibition felt like stumbling into a fever dream simultaneously nightmarish and erotic. At Hong Kong’s Empty Gallery, “The Garden of Loved Ones” presented a series of collages, videos, and sculptures centering on one of Hawkins’s long-standing obsessions: Tatsumi Hijikata, founder of the Japanese Butoh dance, whose ashen, convulsing body pervaded the artworks in the presentation.