As the subject approaches the speed of light relative to the observer the plane of the subject rotates on the Y axis tilting from the observer creating a warped rectangle shortening length, stretching time as the subject is moving down a spacetime hole and not along the same spacetime trajectory of the observer..
When the small cube is placed outside the larger cube it is the timeline view and shows the spin of the subject plane into the y axis and if switched would show the observer plane shift out of Y axis.
When the small cube is placed inside the larger cube the traditional hypercube you would see the quantum and hypersphere view and how the quark anti quark and the standard model will work and how it is connected to the hypersphere and will connect to the wave function of the particle.
Note it will also intuitively show that the hypersphere can also be placed in timeline view to understand out Electromagnetic world more effectively.