Indeed, while you might assume that an exhibition of Land Art would consist only of records of works rather than the works themselves, Long's photograph of his work is the work.

In a 1757 essay, the philosopher David Hume argued that because "the general principles of taste are uniform in human nature", the value of some works of art might be essentially permanent.

Spending 12 hours a day at a computer might be unhealthy, but for most of us – Warcraft players or not – this is how modern life works.