RE: Sub-Dimensional Windows! - The Movie... What if I told you that every corner in every room/object was a sub-dimensional Tetrahedron Pyramid that acts like a camera/window for "them" to peer into our world...

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Hounds of Tindalos
A Hound of Tindalos is a fictional creature created by Frank Belknap Long and later incorporated into the Cthulhu Mythos when it was codified by August Derleth. They first appeared in Long's short story "The Hounds of Tindalos", first published in the March 1929 issue of Weird Tales. Lovecraft mentions the creatures in his short story "The Whisperer in Darkness" (1931).