"Your Lordship is deceived by an optical illusion," said the young captain.
She was visited by no more ‘optical illusions’ or ‘cataleptic’ fits.
This causes a kind of optical illusion which is favorable to the flat-footed.
So we are told that soldiers' visions are optical illusions.
And yet we are asked to believe that all this is merely an optical illusion.
With these Hertzian waves all manner of optical experiments can be performed.
It is a shifting of the optical laws, of the entire body of physical laws.
This seriously affects the value of such lenses for optical purposes.
This, however, owing to the frequency of optical illusions, is not the case.
Without, there is light; within, an optical machine adapted to it.