Most drones are just cameras that fly. Cheaper and easier to use than helicopters, drones can add aerial photography and overhead shots at low cost to films, where they form part of the director's toolset. Liam Young, a speculative architect based in the United kingdom, teamd up with writer Tim Maughan to create a film shot entirely by autonomous drone cameras.

That film, In the Robot Skies, will premiere at the London Film Festival on October 8. The trailer was released online last night, and we can already discern some of the features of the world. There's aerial surveillance, and hulking security drones. The machines identify and label people, and behaviors, recording anti-social actions and confining the anti-social to their homes.

And there are other drones, flown by the confined as a way past the robotic sentries.