For example:
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When you open a fresh jar of peanut butter do you only work through one side until it is completely empty then start on the other side?
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Or when you get those shallow tubs of hummus does it have to make it back home undisturbed? Then one of the baggers at the grocery store shoves it sideways into the bag completely ruining the symmetry.
A friend’s dad feels so strongly about this that he has cafeteria style trays so each food item can have its own little area walled off from everything else.