The phrase that you hear and read on the London underground, alludes both to call attention or warning and a kind of mystery (beware the gap). In this case serves the artist to portray current society and how it maintains a continuous fracture (based on the impossibility of what one has always wanted and the real focus in a sort of serious down to hell in the ordinary) between dreams and realities, or perhaps ever more exaggerated West and "the rest". The poster, stencil, the sound are the weapon that in this case he uses room. Mind the gap relates, directly and without digressions the insurmountable distance that separates the ordinary people of the ruling class of the elite, the power and the people. It is the poetry of the fracture. Represents what happens in our new societies in which the distance is a growing, though there is still hope to save it, let's not forget utopia.