4th Dimension
The mathematical extension of the concept of 3D space and the limit to the observable universe.
Expansion. The Line.
The first dimension is a line that has only length, allowing movement only forward or backward. It is the simplest spatial dimension, defined by a single axis (like the x-axis on a graph) and requires only one coordinate to specify a point. Examples include drawing a line on paper or measuring the length of a single-dimensional object like a string.
Lines in the 3D? CAD's approach.
Lines have no thickness in 3D programs by default because they represent mathematical lines, which have zero width. Users can even enable display settings or use specific tools to make these lines appear thicker for visualization. While these lines can be read by devices like Laser Cutters, they cannot be read by 3D Printers because they take up no real space.
