The old observatory on Edinburgh’s Calton Hill may be the most favourably positioned art venue in the world. Recently resurrected by a group called Collective, the space, with its panoramic views and Enlightenment history, is an ambitious and imaginative addition to Edinburgh’s art scene.

In their Hillside gallery there’s a firing-range warning sign on the screen, a few seconds of stillness and silence, then a sudden machine-gun rattle.