This ?Ambiguous Cylinder Illusion? is a finalist of the best illusion of the year contest in 2016 and it was created by Kokichi Sugihara from Meiji University, Japan. The way the illusion is created is that the tops of the pieces are not flat, but angled, so that different shapes are seen from different downward viewing angles. From your position as viewer (camera), you see the actual tops of the pieces at a steeper angle than you see the reflected tops. This is a really cool illusion, but it only works if the camera and mirror angles are aligned just right.
Mind Blowing Cylinder-Rectangle Illusion
Video by TheIllusioncontest