Well, it is nothing else just an illusion..
This is a flat 10” round pine plate, chip carved in a way that one will see a ball.
And what is an “Event Horizon” you may ask…
When I was reading “A Brief History of Time” from Stephan Hawking (the second time, because the first time I only understood about quarter of it or less), the theory of banding space-
I see the black hole located in a sphere of no return, and this sphere is the event horizon. But don’t tell this to Mr. Hawking, please.