gravity

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Cube (allthetropes.org) Cube is a Canadian science fiction/horror film series. The three movies are each based on the same premise; there is a gigantic, mechanical, cube-shaped structure (the purpose and origin of which is almost completely unknown) that is made up of lots of smaller cube-shaped rooms. Each of these rooms has 6 doors, one on each wall and one on the ceiling and one on the floor, which lead into adjacent, identical rooms, only differing by color. Some of these rooms are safe, while others are equipped with booby traps such as flamethrowers and razorwire which kill a person who enters the room (in some cases it is possible to detect a trap by throwing a boot into the room first, except in Cube 2: Hypercube where the traps are less distinct - in the form of an abstract shape and visual effects - and less predictable).

I used to think that I was stupid, and then I met philosophers. Terry Pratchett, Small Gods
I was sitting in a chair in the patent office at Bern when all of sudden a thought occurred to me: If a person falls freely he will not feel his own weight. I was startled. This simple thought made a deep impression on me. It impelled me toward a theory of gravitation. Albert Einstein
There is no difference in the gravitational behavior of matter and antimatter. In other words, antimatter falls down when dropped, not up.

Gravity (Wikipedia) In physics, gravity (from Latin gravitas ‘weight’) is a fundamental interaction which causes mutual attraction between all things that have mass. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak interaction. As a result, it has no significant influence at the level of subatomic particles. However, gravity is the most significant interaction between objects at the macroscopic scale, and it determines the motion of planets, stars, galaxies, and even light.