Near a black hole’s event horizon, spacetime warps dramatically due to extreme gravity. Outside, time flows linearly, and space allows free movement. Within the event horizon, the radial direction toward the singularity becomes timelike—inescapable and unidirectional, like time outside. Time, meanwhile, behaves like a spatial dimension, but all paths lead to the singularity. This role reversal between space and time is caused by spacetime curvature. The accompanying image shows normal spacetime outside and intense warping near the event horizon, where time becomes unavoidable and space behaves strangely.