Groucho:  "What strange place is this?"  Jim thought.  "Whatever one thinks about, the Island creates a mirage of it. "

Suddenly it occured to him that such a situation could lead to trouble.  What if he were thinking of something that led to a dangerous or even deadly mirage?

He hardly had time to think about that last question when a shudder surged throughout his body.  Was he now seeing things?  What was his last thought?  He didn't have time to wonder any longer.  Something was moving in the distance.  Something big.  And it was coming his way.....