Mirroring an object with a Mirror modifier

In this section, we are introducing the Mirror modifier. Modifiers are operations performed by Blender on an object to manipulate its geometry non-destructively. This means that Blender will change the object in a certain way, depending on which modifier(s) we create, without making irreversible changes, therefore, the change can be undone by simply removing the modifier. Modifiers are usually used for actions that would be too time-consuming or difficult to perform manually (https://docs.blender.org/manual/en/latest/modeling/modifiers/introduction.html).

A Mirror modifier is a simple modifier that just reflects the mesh over a certain point, making it perfectly symmetrical over that point. The symmetry point can be changed, but by default, it is the object’s origin. The origin is the point where an object is located in 3D space. Every object has an origin that is set to the object’s center of mass by default and can be placed...