What remains? Of memory, sentiment, or technology? While we are often obsessed with the future, our infrastructures are always permeated with multiple pasts. We regularly encounter, often without noticing, the faint traces of other users, bodies, objects, and things in our environments. These histories and memories, sometimes not even our own, shape how we listen, read, see, and design the world. Beauty, comfort, horror–all these emotions and sentiments are informed by our previous experiences at both individual and collective scales. We live in a world permeated by temporalities, restless spirits, historical remnants, involuntary memories, and archeological artifacts; barely conscious residues that shape our emotions, experiences, and futures.