The 4D equivalent of a cube is known as a tesseract, seen rotating here in four-dimensional space, yet projected into two dimensions for display. (Wikipedia, Four-dimensional space) What means dimension? The fourth dimension is the theoretical thing that cannot model in a 3D universe. The thing is that when the energy level of particles is starting to grow. They are getting the attribute that it has not before. We can say that Higgs Boson is "only" an extremely high-energy electron. The thing is that some researchers believe that Higgs Boson is at least close to the particle that is next to photon and other particles. The photon is a gauge boson. And Higgs boson is a scalar boson. The thing that makes Higgs Boson remarkable is it that is the first in the line of scalar bosons. We can think that dimension is the space or room where the particles and wave movement have a certain energy level. When the energy level rises high enough causes that the particle slips into another