An artist called me the other day very distressed. Appears that she had got an email from a client who wanted to buy one of her works. She called the gallery who had the work on consignment, only to be told that the work was out on loan. It appears the gallery was hiring work out to clients who whether for financial reasons or variety did not want to actually buy the work. This is common in New Zealand for instance and should benefit all parties except for this galleries 'omission' to inform the artist (and part with some of their loan fee.) Fees for hiring to film sets in particular, can be considerable, so make sure that you inform your gallery (preferably in writing), that should they loan your work out you want to be informed as well as receive a say 50% portion of the fee.