` I've been much too busy to make any 'CliffsNotes', though I thought I'd indulge you with something book-related nonetheless.
` See, I used to have this book called Napalm and Silly Putty by George Carlin. It was pretty funny, and I remember that he had said something like this:
` When you rub your eyes real hard, do you see that checkerboard pattern? Why is that?
` You mean, like this?
` I see that one myself, sometimes: It's called a pressure phosphene.
` As far as I am aware, a phosphene is a visual qualia occuring without the presence of light, caused by magnetic, electric, or mechanical stimulation - or possibly the random firing of neurons.
` Pressing on the eyes tends to stimulate random cells in the retinas via interocular fluid, hence the term 'pressure phosphene'.
` In fact, I pressed on my eyes just now and saw what appeared to be moving liquid, as well as a very clear wire-frame model of a complex, symmetrical, and many-moduled space station that revolved in various directions.
` I have no idea what that was all about - must be my exhaustion. Unfortunately, I eventually had to stop watching because my eyes were becoming sore.
` Anyway, 'phosphene' is a word for this, though so is 'entoptic phenomenon', which means 'something which happens within vision'.
` Personally, my favorite such occurence is when I simply close my eyes when I am very tired: Typically, a drawing of something appears and begins rotating and mutating into different forms.
` This is a type of hypnagogic reverie, which - as far as I know - is a type of hallucination (usually visual), induced by falling asleep. I usually don't fall asleep, however: I tend to stay half-asleep so that I can keep focusing on it.... It's just so fascinating, you know?