Forget about empty space and light, by far the most significant curvature in human experience is the curavature of the Earth's surface You only need to travel b

Forget about empty space and light, by far the most significant curvature in human experience is the curavature of the Earth's surface You only need to travel by boat or air (and maybe automobile), or set up some mirrors to bounce light around the Earth (for example: radio), to gain an appreciation of that curvature. But travelling on foot, the curvature is not really noticeable.