There were published at the site other images with impossible triangles, which are consist of dices. There are photo of sculpture by and Donald Martin. And now we see a photo montage of such triangle.
If you pay attention to the bottom right corner, you'll see difference of sizes between green and black dices.
Images for this montage were made with help of high quality telephoto with 150 mm focus range.
The image was found at http://dpnow.com/forum2/showthread.php?t=6748