02-O / Applied Physics
Original Edition
Event Horizon Transit Authority
Inbound service is excellent. Return service terminates at the event horizon.
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Behind the designRead the optional note
A black hole’s event horizon is a one-way causal boundary: after crossing it, no signal or traveler can return to the outside universe. The design translates that irreversible journey into a metropolitan transit diagram.
The joke works because a transit authority can promise dependable inbound service while remaining completely honest about the lack of a return route.