If you use gmail, I think you already watched new loading animation when you login your Gmail account. When I saw it at first time I was really inspired to create this animation. Then I did it and decided to make After Effects tutorial about it, so check it.
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Lonely_Troutman_II – William Rosati
Stasis_Attempt – Max McFerren
Sunspots – Jeremy Blake
Trips- Topher Mohr and Alex Elena