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
After what's been the hottest day in the region for almost 10 years there are warnings tonight about the dangers of swimming in open water.
Today was the hottest day of the year so far but temperatures will be down a little tomorrow with the risk of thunder.
A sizzling day for the Anglia region with temperatures rocketing into the mid 30's.