Sentence:  The tempest he conjures up can also be seen as a form of <WSD>ilinx</WSD>, in which those on the ship are tossed and tumbled about by his magic, a dark form of play in which Prospero alone knows that they are safe. 
Meaning of the word marked with <WSD> tags:  A form of play that creates a temporary disruption of perception, for example by inducing vertigo, dizziness, disorientation, or frenzy.