Hi Inchiki,
It has something to do with the mnemonic memory system (associations - loci, peg words, that kind of thing). I haven't read Buzan's book on that but I am familiar enough with the mnemonic systems. If you want a look at it, it is on this web page under level 4:
http://www.smartsmartsmart.com/print.php?sid=5
It seem to be just another variation of the systems and it's simple enough to understand if you use mnemonics already.
