The best 4K videos on the internet include...
Alchemy
http://www.youtube.com/watch?v=eYqIEBpbRhg
Ink Drops
https://www.youtube.com/watch?v=k_okcNVZqqI
Postcard from Innsbruck
http://www.youtube.com/watch?v=EbvVpvXwlKU
Australia
https://www.youtube.com/watch?v=tJGnHB3rtMU
Barcelona
https://www.youtube.com/watch?v=6QET6vYvle4
England
https://www.youtube.com/watch?v=9HTEZkTA11Q
Wildlife
https://www.youtube.com/watch?v=xDMP3i36naA
TimeScapes
https://www.youtube.com/watch?v=EgKXcQ9PLuc
Dubai Fireworks
http://www.youtube.com/watch?v=T-MUWJWqOv0
The World Outside My Window
https://www.youtube.com/watch?v=GOAEIMx39-w

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Music: "Dream Culture" - provided by the incomparable Kevin MacLeod (incompetech.com)