The world knows only three spatial dimensions left and right, up and down, forward and backward. Mathematically besides some extremely bright people have debated that actuality may be encompassed of at least four spatial dimensions. Modern string theory depicts suggesting up to 10 spatial dimensions.
These are relatively abstract ideas with uniformly abstract evidences. This is the reason why a current enquiry executed by Swiss and American physicists is so exhilarating. Their work indicates a probable course by which higher-dimensional situation can be perceived in a low dimension order, perhaps even ours.
As it is estimated, such experiments deal with good old friend, quantum mechanics that always succeeds in our brittle actuality and marvel the mind. Typically each of the two teams, one in the USA, the other in Europe, conceived an exploratory setup, one pertaining to ultra-cold atoms, and another with light particles that permitted them to discern the fourth spatial dimension, by virtue of the quantum Hall effect; the emphatic of the genre of the effect to be more specific which was earlier prophecy to take place in 4-D systems.
To comprehend what the researchers are on about it assists to picture a more accustomed example. When hit by light a 3-D object will cast a 2-D shadow. Though the shadow lacks depth, you can still apprehend much more about the 3D object that propels it. For example a circle correlates with a sphere and a square correlates to a cube. Antithetically, a cube can be considered the shadow or 3-D projection of a 4-D object called a hypercube, which cannot actually comprehend just like a 2-D ‘flat-lander’ just not stand a chance of envisioning 3-D. Considering all these factors in mind, we can consider quantum Hall physics as the “4-D shadow” exhibiting itself in 3-D.