Life Through Two Lenses

When I was eight, our teacher hung a yellowish piece of paper on the blackboard and said, &ldquo;Copy this.&rdquo;&#xA;I was sitting at the end of the classroom and suddenly felt confused.&#xA;I could only see a large, blank sheet.&#xA;After a while, I remember raising my hand and asking shyly, &ldquo;Mrs. Teacher, I can&rsquo;t see anything there.&rdquo;&#xA;She must have been used to that…