Don’t know how they did this: mind blown.

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My friend Joe Stewart says, “It’s actually for the same reason a lot of drivers don’t see motorcyclists. The back of our eyes have blind spots where we don’t actually see anything. Our brain knows this, so what it does is fill in the bits it doesn’t see with stuff it remembers it saw or thinks it should be seeing in that spot. By fixing our attention on the cross, our brain starts extrapolating what it thinks it should be seeing from adjacent optical cells.”