In 1973 Les travelled from Castlemaine to attend the Aquarius Festival in Nimbin. There, he illuminated a huge tree with coloured lights as his contribution to the atmosphere.

He also participated in a screen printing workshop where, using rudimentary techniques, he made his one and only screenprint. His intention was to denote the barter economy on site with the cash register symbolising commerce and the fruit and vegetables among the currency used.

The Barter Economy, Leslie Thornton (produced at Nimbin), 1973, Screenprint 1/1 50cm x 37cm