This is a Ferrophoto of a Ring magnet, actually a stack of four 1/8 inch ring magnets making a 1/2 inch stack. The ferrophoto shows a positive and negative image of a magnet field depending on which side of the ferrphoto is viewed.
Follow the link to see video Steemit does not seem to show the video from Bitchute , I guess Steemit is still not ready for prime time.