Yes, it came from the 4th Dimension! The 600 Cell Polytope.

No, it's not an alien creature. It's a complex 4-dimensional geometric object, equivalent to our own 3D icosahedron. When it pushes through from the 4th Dimension, this is one of the shadows that it can cast in our own 3D space.

This one was captured and filmed by Wizard Gynoid in Second Life, and was scripted by Desdemona Enfield. Soundtrack by Jana Kyomoon.

And yes, there was some additional scripting done by Glyph Graves. (less info)