Blocking Bad Light Sources(Sjogren's?)

 I always noticed that I feel better under a tree, but never could figure out why. Appears that a minimum 0.5 mm natural plant fiber blocks bad light. The fiber can be anything from cardboard to cotton. Two t-shirts are that thick which explains my improvement during the winter with thick clothes. Also 20 oz canvas is 1.00 mm and I'm exploring using it for blocking hot spots in the house. 

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