Gravity

We, by ourselves, observe the world.

We, by ourselves, develop language to describe the world and its regularities.

Gravity - the weight of an object that returns it, if unsupported, to the ground, is at once the most obvious, and the most mysterious, of regularities.

Regular; so as to pass unremarked by the naive mind. So regular that the absence of gravity (pictured) is a fascination.

Mystery: that defies fundamental explanation.

Newton described gravity as an inverse square force-at-a-distance law.

Einstein described gravity as a curvature of space induced by the presence of mass.

Gravity is still a puzzle. No one has explained it.

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