Even more fun if you discovered a famous artist like Tracy Emin painted the postcard you bought.
Ciaran chose the piece below and after handing over the €50 he turned to the back of the card to see that was painted by Liam Plant.
I visited on Saturday with Ciaran when he bought this piece and then returned on Sunday with Amy for another browse.
It was a really popular exhibition with people lining up really early to get in and choose their favourite pieces. Here's an RTE news report that captures the excitement of the event.