The pink lines are parrallel coplanar lines because they are on the same plane and will never intersect. Blinds are very useful because they let light into one's house, instead of using electricity. The lines will still be parrallel and coplanar if the blinds are opened. Blinds are a everyday use to keep light out or let it in, almost every home has blinds installed for privacy. I took this photo in my house with my phone.
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