This amazing painting has been in the newspapers this week, together with photos of how it was made.
If you missed out on seeing it, head on over to this page at the Mighty Optical Illusions site and you'll see exactly how it was done.
The painting is the work of Craig Tracy and here are some of his other masterpieces. Without knowing how the images were created, these will really make you question exactly what you're looking at.
If you have a look at Craig's website, you'll find fascinating insights into his motivations and technique. There are also plenty of behind-the-scenes photos and videos which will help you make sense of it all. Even then, you still might not believe what you're seeing is true.