This is a Flash video called Ljósiđ, created by Esteban Diácono. Ljósiđ means "light" in the Icelandic language.
The music was composed by Ólafur Arnalds, multi-instrumentalist and producer from Mosfellsbćr, Iceland. One should note the complementary nature in this video of sound and image.
Esteban Diácono is a motion graphics designer based in Buenos Aires who has been working in the design / motion graphics / postproduction industry for many years. The video was created by use of After Effects (motion graphics software published by Adobe Systems) and Trapcode Particular (particle system software, developed by Red Giant).
14 MBs. Playing time about 3 1/2 minutes. Repeats after completing.
MOCA's Digital Video and Audio Index