The Stock Exchange

A long thin table at the entrance to the shop. Visitors are encouraged to exchange something they have on their person (anything) for a stock cube. They are also welcomed to come back another day with a stock cube of their own, to exchange for something else on the table. 

Over a fortnight the table has amassed: cigarette filters, shells, a chocolate wrapper, business cards, two records, pens, tampons, chocolates, aftersun, string, toilet paper, drawings, loyalty cards, a screw, a hair grip, chewing gum, foreign currency, an expired gift voucher, a badge and more.