In the meantime I'll try and 'broadcast' the hidden thing mentally for a couple of days. If you like you can report dreams, words, ideas or images that come to you in that time.
I'm completely not expecting this to 'work' but at the same time it would be very good fun to see what happens. I'm also very happy for people to make sceptical remarks. If anyone has any opinions or technical drawbacks to bring up, please do.
I will change the security level of the hidden post to 'public' in three days, on the 21st December, the winter solstice. Please do join in if you can. Not you, happytune, because I already told you what I've picked.