To the French ace it seemed that his eyes were all blind spots, so far as the Master was concerned.

The effect of this vacancy moving about, shifting a chair, stirring a book, speaking to him like a spirit disembodied, its footfalls audible but its own self invisible, chilled the captive's blood.

The Master said: "Now I have totally disappeared from your eye or any other material eye.

I cannot even see myself! No doubt dwellers on some other planet would perceive me by some means we cannot imagine.

Yet I am materially here.