“How Gravity Falls” by YouTube host Edward Current is a handy explanation of how a warping of space and time causes gravitational attraction that utilizes a sheet of graph paper stretched using an attached crank. Current built the “Spacetime Stretcher” to offer an easy-to-follow explanation of Einstein’s general theory of relativity.
For centuries, gravity was described as a sort of attraction between two objects. Then Albert Einstein described gravity as a warping of space and time.
via 22 Words