I will not argue maybe you are right but all most of the merits you have mentioned about DYI book chair are applicable to the one you can buy.
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far more stable when poised on your belly in bed or sitting
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Absolutely stable.
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Probably the biggest difference is that it rotates the reader so, when you lie sidewards, the text lines are always parallel to your eye line.
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Why cannot you rotate it on "my" (mind you, I don't use any book chair, I prefer to use my hands, so I am not trying to "sell" anything, but I did experiment with my book chair) book chair?