Crooked Man's Optical Illusion

Here is another excellent illusion. Looking at this image things seem a little out of sorts.

Is it leaning to one side?

The truth is that each square that makes this image up is the exact same size. Some have white borders and some have black borders but the whole image is plumb. That is to say that the lines vertical and horizontal are all respectively parallel to each other.

To paraphrase a nursery rhyme despite the title above this is not the "The Crooked Man's Optical Illusion"

Crooked Man's Optical Illusion

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