2. Two-dimensional space, also known as 2D, refers to a plane space consisting of only two elements: length and width (X axis and Y axis in geometry), which only extends in the plane. It is also a term in art. For example, painting is to use two dimensions to express three-dimensional things.
3. Three-dimensional space is also called three-dimensional space, that is, length, width and height constitute "three-dimensional space". Three dimensions are front, back, up, down, left and right. Three-dimensional things can accommodate two dimensions. The three axes of length, width and height in three-dimensional space explain the distance relationship between the object and the origin O in three-dimensional space.
We weave some rubber ropes into a net according to the pattern of longitude and latitude, and then flatten it. We can treat it as a two-dimensional plane approximately, and then put a small ball on the net. The rubber net sinks under the gravity of the ball, forming a three-dimensional space.
Three-dimensional space can be expressed in the form of animals and plants in our lives!
"Dimension" here means direction. The spatial pattern established in one direction is a one-dimensional space, which is linear and only established in one long direction. The spatial pattern established by two directions is a two-dimensional space, which is flat and is established by two directions: length and width. In the same way, three-dimensional space is physical and is established in three directions: length, width and height. Four-dimensional space is the fluidity of time and space, which is established in four directions: length, width, height and time.