Posted by Shadow on Thursday, September 9, 2010 at 9:51pm.
Earlier you told me "hold a pencil up. A real pencil. I bet you can make perpendiculars in many directions, because the pencil is in a three dimensional space". Could you explain to me what do you mean by this? I try holding up a pencil and doesn't see anything.Thanks

To:BobPursley  Ms. Sue, Thursday, September 9, 2010 at 9:59pm
No matter which way you old it, it is perpendicular to some plane.
Hold a book at different angles. Can you hold the pencil in such a way that it's perpendicular to the book, no matter which way you old it?

To:BobPursley  Shadow, Thursday, September 9, 2010 at 10:05pm
Yes.
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