My avatar generated by lumilumi.app is one of the those figure-ground illusions. Half the time I see the blue guy looking to his right and slightly downward, half the time I see him as looking to his left and slightly upward. What do you see, down or up? 
Discussion
I only see the face looking at his left and slightly upward. I look at the shape as a full circle, mostly ignoring the brown color at the left of the shape.