Don't know whether to be sad or happy. I'm pleased that somebody liked it so much that they wanted to buy it, but now that it's gone, no one else will be able to see it in the exhibition.
Normally when items are sold from an art exhibition the buyers can't remove them untill after the exhibition has closed. I have just checked the brochure and it states, 'There are sure to be some unique and beautiful new creations, all of which will be available to buy and take away.' So there you go then, that's plain enough. Flog them all and when there's none left the exhibition is closed.
I asked for two more bags, better make some more to replenish the dwindling stocks, ha ha.