๐ Astronomers discuss the large-scale structure of the cosmos and refer to space as curved or the universe as finite but unbounded.
๐ณ Imagine living in a flat land where everyone is exceptionally flat and has no height, only width and length.
๐ In this hypothetical concept, Edwin Abbott, a Shakespearean scholar, created the concept of flatland.
๐ The concept of dimensions and how we perceive them.
๐ณ The encounter between a 3D creature and a 2D square in Flatland.
๐ The confusion and unease of the square when interacting with the 3D creature.
๐ A three-dimensional creature enters the two-dimensional world of Flatland and can only be seen as a cross-section.
๐ The presence of the three-dimensional creature in Flatland is represented by gradually revealing higher slices of an Apple.
๐ The square in Flatland observes objects mysteriously appearing and changing shape, leading to the conclusion of entering a different dimension.
๐ A contact between dimensions causes a square in flatland to see inside closed rooms, giving him a new perspective on his world.
๐ The square's descent back to flatland creates confusion among his friends, who believe he mysteriously appeared from another place.
๐ The video discusses the concept of dimensions and explores the idea of the fourth dimension.
๐ง A cube can be used to explain the concept of dimensions. Moving a line segment at right angles to itself creates a square, and moving that square at right angles to itself creates a cube.
๐ The cube casts a shadow, which represents the three-dimensional projection of the cube in our world.
๐ก The representation of a three-dimensional object in two dimensions is not perfect due to the loss of a dimension.
๐ When a three-dimensional cube is projected through a fourth physical dimension, it forms a four-dimensional hypercube called a tesseract.
๐ Although we cannot visualize a tesseract in three dimensions, we can observe its shadow.
๐ The tesseract is a four-dimensional object consisting of two nested cubes.
๐๏ธโ๐จ๏ธ In four dimensions, the lines of the tesseract would all be equal in length and all angles would be right angles.
๐ We can think about the concept of a four-dimensional universe, even though we cannot imagine it.
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