For the French philosopher Pierre Lévy, »the virtual, rigorously defined, has few affinities with the fake, the illusory or the imaginary. The virtual is not at all the opposite of the real. Quite the reverse, it is a rich and powerful mode of being, loosening creation processes up, opening futures, digging mines of meaning under the dullness of immediate physical presence.« Virtual is the opposite of actual. The virtual tends to actualize itself, without effective concretization. For instance, the tree is virtually present in the seed. Gilles Deleuze shed light on the difference between virtual and possible, the possible being exactly like the real, only it does not exist, whereas the virtual needs to be actualized, created out of problematics, circumstances, constraints...