If I watch through a binocular, the things I see on the left eye var(left) covary with the right one var(right) I see cov(left,right)
If I watch through a simple looking glass, the things I see on my left eye covary with the left one. I see cov(left,left) which is var(x)
If I watch through a binocular, the things I see on the left eye var(left) covary with the right one var(right) I see cov(left,right)
If I watch through a simple looking glass, the things I see on my left eye covary with the left one. I see cov(left,left) which is var(x)
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