3D Work Selection

Other popular methods of describing the location of a point in threedimensional space include cylindrical coordinates and spherical coordinates, though there are an infinite number of possible methods.
Another mathematical way of viewing threedimensional space is found in linear algebra, where the idea of independence is crucial. Space has three dimensions because the length of a box is independent of its width or breadth. In the technical language of linear algebra, space is three dimensional because every point in space can be described by a linear combination of three independent vectors. In this view, spacetime is four dimensional because the location of a point in time is independent of its location in space.
Threedimensional space has a number of properties that distinguish it from spaces of other dimension numbers. For example, at least 3 dimensions are required to tie a knot in a piece of string. Many of the laws of physics, such as the various inverse square laws, depend on dimension three.
The understanding of threedimensional space in humans is thought to be learned during infancy using unconscious inference, and is closely related to handeye coordination. The visual ability to perceive the world in three dimensions is called depth perception.

