How Many Cubes?

How many cubes do you see in this optical illusion picture? I only see 6 cubes. What about you? Do you see more than 6 or 7 cubes?
Update: Thanks to Tim who let me know there are 13 cubes in this illusion pictures. There’s the 6 cubes where the black is the top of the cube, and then another 7 if the black is facing you.
Tips: If you want to see 7 cubes, you have to look at the black color of the image for a few seconds. If you want to see 6 cubes, you have to look at the blue color for few seconds too.
Source: How Many Cubes
Tim said,
March 7, 2007 @ 10:30 pm
13 cubes. There’s the 6 where the black is the top of the cube, and then another 7 if the black is facing you with the light/dark blue on top (cubes sitting on their edge)–or you can tilt your head 45 degrees to one side and you might be able to see them easier
admin said,
March 8, 2007 @ 12:40 am
Tim: Thank you very much. Ya, after i moved my head 45 degrees to one side and i could see another 7 cubes. Thanks for information.