Which amazes you more? The Ebbinghaus Illusion, the Fraser Spiral Illusion or maybe it's the Kanizsa Triangle that fascinates you. Those are only 3 of 20 optical illusions for you to gaze and ponder at.
That sort of stuff always amazed me. But of course it doesn't take much to amaze a simple mind like mine. That Lilac Chaser is awesome.