Coins
performance, 2017
(click still to see video)

Spectators received a small purse. Each purse contained three 1 euro coins.
Prior to this, everyone paid 3 euros to enter the room. This entrance fee was safely locked inside the blue suitcase that can be seen in the video around 00:40 and was later brought to whoever collected entrance fees for 'Theater aan Zee' in 2017.