Yes, it's that time of year again, or in this case that time of year for the first time ever. Remember this moment, because you only hear about International Rock Flipping Day for the first time once.

It's explained here by Via Negativa, rock flipping impresario. The day of all days is September 2. All you have to do is flip rocks and photograph the life revealed. Rather charmingly, he emphasises the need to replace the rock to protect the critters, unless you're planning to eat them. Clearly a boy after my own heart.

There's also a Flickr group to post your results on. I suppose you could call it a rock group. Or a rock pool. Or you could just shut up. If I was, say, a B-list Flickr celebrity with a pack of adoring followers who'd recently moved to a small town in Somerset, I might well be tempted to have a go. Bristol City ticket holders with two sons who recently celebrated a milestone birthday are another promising sub-group of potential entrants, as are people called xoorx.

Flip on, dudes.