Time Travel

The past or the future becomes a place, and someone goes. Distinct from the loop\'s closed circuit, open time travel is the genre\'s instrument for putting eras in a room together, and the desk shelves it by what the journey is for: witness, repair, escape, or war.

The premise\'s bill is consequence across the grain. Whatever mechanism the story picks, fixed history, branching worlds, mutable timeline, it must then obey its own physics to the end, because time travel is the trope where a single cheat retroactively unwrites the book, and the desk grades rule-keeping here more strictly than anywhere on the shelf. The deeper invoice is moral: a traveller among the past\'s people either can act or cannot, and both answers cost, helplessness before recorded suffering, or responsibility for everything now alterable. The strong versions choose their cost and hold it. The mirror shows memory itself, the one time machine issued as standard. The failure mode is travel as tourism, eras visited for costume while the machinery\'s bill, paradox, grief, accountability, is quietly refunded off page.