The process of interaction with virtual objects actually happens, but obviously can not be compared to what happens in the real world. In order to achieve certain results must be provided with a graphical user interface (representing the virtual world) and, in particular, three main variables should be handled:

Space: This element can be changed at will. This possibility is the fact that it is a simulated environment and not the real space.
Time: the perception of this magnitude can be very different depending on the situations in which a person is to find and what is happening around the observer.
Interaction: environments and situations are not static but are generated depending on the user behavior, which is a protagonist of the events.