A Slightly Curving Place asks what it means to listen to the past and its absence which remains. It responds to the practice of acoustic archaeologist Umashankar Manthravadi, whose life and work are a history of sound and technology through the second half of the twentieth century. As a self-taught acoustic archaeologist, he has been building ambisonic microphones since the 1990s to measure the acoustic properties of premodern performance spaces. Comprising a range of perspectives in which his propositions reverberate, the publication attends to what he does, and to the political and performative potential of the past that he opens up.