Martin Brown wrote:
Have any of the very deep Pi memorisers explained how they do it?
(I know of various poems for modest lengths but 100k digits is
astonishing)

A common technique is, as you say, to memorise some text where the
lengths of the words corresponds to the digits in the sequence.
Another is to remember a story where the nouns and other significant
words correspond to the digits. So, for example, you could associate
five nouns with each digit to give enough variation.


The only other time I have seen it discussed the person had
synaesthesia and saw number patterns as colours.

Sometimes, the human brain is broken in really interesting ways. :-)


Dave.

--
David Richerby Natural Bulb (TM): it's like a light
www.chiark.greenend.org.uk/~davidr/ bulb but it's completely natural!