A Dr WHO story was set in an Escher self-referential world.

You should all read "Escher, Godel and Bach - an Eternal Golden Braid" by Douglas Hofstedder - a Pulitizer Prize winner. This explains Escher's 'self-referential' pictures and other interesting related things in computing, philsoiphy, music and very advanced mathematics...

I HAD tried to read it several times, got bogged down, gave up. Then when the doctor had given me some special medicine for an inner ear infection - one drop on a sugar cube a couple of times a day - conatined noradrelin and a few other 'goodies' !!!?!- I flashed thru the whole book in a couple of hours, and completely and intuitively grasped the lot. I've previously mentioned this here. Perhaps that was what 'opened my mind' so that I topped the IQ test a few years laer.... :-P

The bit about talking to an ant's nest is true - and it DOES work! - but my mum stopped the experiment and insisted that I go back to bed...