Sentence:  Earlier we gave the example of a plane taking off in the third dimension apparently disappearing from the view of a two-dimensional <WSD>flatlander</WSD>; analogously, particles appearing from the fifth dimension, or disappearing into it, could be a signal at the LHC that space-time is indeed, like Emmenthal cheese, permeated with little bubbles which are at the edge of our present abilities to measure. 
Meaning of the word marked with <WSD> tags:  An inhabitant of or observer in a universe with two spatial dimensions.