Piltdown man is on display. Banksy, "artist who depends on trying to one up the establishment for funnies", has slipped an (admittedly amusing) rock into the display. It wasn't noticed, which probably took all the wind out of his sails.

It was placed beneath a limestone statue, a 1st Century tombstone found in Tower Hill and a case full of statuettes from Roman Britain in Gallery 49.

Banksy had placed it alongside a caption, stating: "This finely preserved example of primitive art dates from the Post-Catatonic era and is thought to depict early man venturing towards the out-of-town hunting grounds."

He added: "The artist responsible is known to have created a substantial body of work across South East of England under the moniker Banksymus Maximus but little else is known about him.

"Most art of this type has unfortunately not survived. The majority is destroyed by zealous municipal officials who fail to recognise the artistic merit and historical value of daubing on walls."

Much as I love museums, I do know that some (Melbourne, this is you) have become shallow echos of what they were, paying homage to 'ease of understanding' over genuine knowlege, patchwork displays asking pointless politcally correct questions over crowded cases briming with mystery.

Onya Banksy.