The the untrained eye, they look like a fleet of tiny UFOs rising up.
However, in reality this is one of the most impressive demonstrations of quadrocopters, tiny four bladed flying machines, flying in a 'swarm'.
A German art festival flew 49 quadcopters in formation in the night sky. A glowing orb that changed colour was attached to each of the tiny flying four bladed machines
The astonishing demonstration was the centrepiece of the voestalpine Klangwolke, a German art and technology festival which took place on September 1st.
'The beginning of this story highlight the discovery of electricity and the subsequent triumph of artificial light,' the organisers say.
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Ready for lift off: The fleet of 49 quadcopters ready to take to the air in Germany for their incredible display
'Breathtaking technical effects, a spectacular interplay of human and robotic protagonists, thousands of illuminated letters and artfully illuminated the architecture of the city itself and wonderful soundscapes are the ingredients of this cloud of sound that will tell us about the interconnectedness of our world.
The display used a fleet of 49 quadrocopters, all controlled by computer to within millimetres.
Organisers were able to to program them to move as a single unit, creating 3D shapes and moving in perfect unison to create shapes.
The complex control software even meant the four bladed copters, which cost around £800 each, were unaffected by wind.
They flew high above the city of Linz and above the river Danube as part of the display.
The team spent weeks programming the display, and the specially developed orbs which were attached to each quadrocopter.
The colours were controlled and changed throughout the display to stunning effect.
Up in the air: The quadcopters take off, in perfect formation, to begin their display
UFOs up close: the LED-illuminated quadrocopter by Ascending Technologies being held on the ground for testing purposes at night.
An amazing display: The quadrocopters (left) lighting up the night sky of Linz during the display
Testing: Each of the 49 quadrocopters had a glowing orb underneath it
Testing: The quadrocopters, made by Ascending Technologies, being tested before the event