Artist Tomas Georgeson says he's left a cheque for £8,000 in Milton Keynes Gallery in the hope it will attract more visitors.
He has placed an advert in the local newspaper, The Milton Keynes Citizen, which reads: "A blank cheque for £8,000 has been hidden somewhere in the public spaces of Milton Keynes Gallery. It will be collected on 1 March 2013 if unclaimed."
Mr Georgeson said he wanted to get people through the door and change the mood of the place.
More top news
The chief fire officer off Essex has been sacked after a misconduct investigation.
Hundreds of people attend funeral of Kyle Warren in Harleston 3 weeks after fatal crash
A total of 1.7 million attacks were carried out against more than 650,000 victims of which just over 52,000 were in the UK.