What most people miss
A horizon is not a brick wall. It is a geometric edge: paths that light can take, and paths it cannot reverse out of. Outside, ordinary physics; crossing is about trajectory and time.
Horizon means geometry, not portal — no wormhole mouth in this chalk.
Why it matters
Black holes taught that spacetime can hide regions from distant eyes. The edge is a rule about light, not a sci-fi doorway.
Human Life angle
A dark sphere, cream photon paths skimming and escaping — wonder without rainbow disks or wormhole fantasy.