The hollow-face illusion is put to good effect here.
The Hollow-Face illusion (also known as Hollow-Mask illusion) is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face.
While a convex face will appear to look in a single direction, and the gaze of a flat face, such as the Lord Kitchener Wants You poster, can appear to track a moving viewer, a hollow face can appear to move its eyes faster than the viewer: looking forward when the viewer is directly ahead, but looking at an extreme angle when the viewer is only at a moderate angle.
Is the hollow-face illusion not working for you? Again, from Wikipedia:
The Hollow-Face illusion is weaker among people with schizophrenia and other populations with psychotic symptoms perhaps as a result of reduced tendency to interpret any kind of ambiguous 3D object as convex. It appears to be related to current mental state, namely in regard to current positive symptoms, inappropriate affect, and need for structure. The illusion seems to strengthen among successfully treated patients.
This Jesus Headstone from woahdude
Magician and optical illusion artist Victoria Skye created the mindbending riff above on the classic “Cafe Wall” optical illusion. (via @martinsytaylor)
Rest in peace, Kosmo.
Relatively interesting has three good optical illusions in this post. My favorite is the Coffer Illusion, which was a Top 10 finalist in the 2006 Best Illusion of the Year Contest, but is new to me. Do to see all 16 circles? For me, it took a while.
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