Spirit Clock features a projected simulation that uses animation and video game software to conjure a ghostly haunting, using an application of Einstein's theory of special relativity. The simulation depicts the same haunted space at three different moments in time, and uses an algorithm to turn these moments like gears on a clock, at rates consistent with he perceived speed of time at ages 9, 20, and 33, representing three encounters with the same ghost through time. When spacetime aligns, the ghost's appearance can be perceived more clearly.