Arcana: The number of all ways

The number 4 is related to the Emperor card in tarot. It is also related to the square. There are four cardinal points, four winds, four pillars of the universe, four phases of the moon, four seasons, four elements, four humors, four rivers in paradise, four arms of the cross, four evangelists, and so on.The number 4 is an even number and can be formed by adding the numbers 2 and 2. Additionally, it is the first number that can be expressed as the sum of two equal numbers. In geometry, it represents the number of sides of a square. It is also the basis of the numbering system used in most countries around the world.In physics, the number 4 has significance in Albert Einstein's theory of relativity. In this theory, the idea is used that space-time has four dimensions: three spatial dimensions and one temporal dimension. These four dimensions are r ...