He tried to open his eyes more widely, but found himself unable to control their mechanism. The sapphire light came in a diffused, nebulous manner, and could nowhere be voluntarily focussed into definiteness. Gradually, though, visual images began to trickle in curiously and indecisively. The limits and qualities of vision were not those which he was used to, but he could roughly correlate the sensation with what he had known as sight. As this sensation gained some degree of stability, Campbell realised that he must still be in the throes of nightmare.