I've tried to visualize

I've tried to visualize

the part of my brain

that corresponds

to that invisible presence in my dream.

How tricky --

I have to imagine my eyes turning backwards,

then send them off swimming round the grey corners

to find the place.

But these glib fish are not up to their task:

I cannot see, only feel the throbbing painless spot.

Is this the unspeakable tumour

I fear so much?