Trolls like to say that trolling is an art form. To troll is to be inflammatory on the internet for the sole purpose of disrupting and offending others. It's more nuanced than it sounds. A troll must be plausible enough to be taken seriously - don't want to give the game away - but outlandish enough to generate the desired outrage.

Trolling is not always successful.

Marcel Duchamp 's 1917 work "Fountain". Credit:AP

On a Friday night less than a fortnight ago, six dancers from a company called BalletLab performed an artistic work at the Australian Centre for Contemporary Art at Southbank. This involved them sitting on toilets and taking a dump.

The defecation was done in a most tasteful manner, obviously. The dancers were masked and cloaked in sheer golden garments. The toilets were transparent. Those involved emphasised how brilliant the performance was. The artist proclaimed that bowel movements were ''humanity's most democratic act''. The centre's director said it was bold and challenging: ''It's wonderful, powerful work.''