If Amazon's delivery drones do actually enter our lives, what will they look like and how might they move around? Will they launch from moving trains or blimps? Will they recharge on lamp posts and self-destruct in midair? If the latest patent issued to the company is anything to go by, perhaps they will be waved down by customers awaiting deliveries.

Amazon filed the patent for a drone system that would allow for human interaction with unmanned aerial vehicles back in July 2016, and was awarded it by the US Patent Office last week.

The documents describe drones that can respond to human gestures, both audible and visual. These would be picked up by the drone's light and audio sensors and compared to a database of human gestures. The drone would then take appropriate action, meaning that it might move closer humans if they are waving it over in an inviting way, or further away if they are performing a shooing gesture and screaming angrily, for example.

Amazon first revealed plans for its PrimeAir drone service back in 2013. The idea is that the unmanned aircraft will drop deliveries off to customers within 30 minutes of ordering. Although it is making some progress on the project, there is still plenty to work through when it comes to regulatory approval.

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