This is a Levitron. It’s a top that floats due to magnetism and gyroscopic stability. The wooden base contains a large ring shaped magnet that repels the top which is a small ring shaped magnet. The spinning top creates a gyroscopic effect that prevents it from flipping over in the large magnets field. The tray and hoop are items I made. The fog comes from an electronic cigarette (E-cig) that I modified to create fog with pure glycerin.