Optical Illusions Art Collection #2

How many cubes?

You may have seen an optical illusion similar to this before, but this time, just take a second with it to truly understand the question posed: How many blocks do you see - 6 or 7? Don't worry about trying to make there be more boxes than there already are - just see if you can see how you could either see 6 boxes or seven - the extra edges don't count!