Participants attend the 'Collisions. A Virtual Reality World Premiere' event at the annual meeting of the World Economic Forum (WEF) in Davos, Switzerland January 21, 2016.REUTERS/Ruben SprichA fish floats by my head while I stand on the prow of a sunken ship. A whale approaches from above, silhouetted briefly by the sun shining through the water. It floats towards me, its baleful eye as big as a train headlight taking in my aspect.