One day, a professor entered his classroom and asked his students to prepare for a surprise test. They all waited anxiously at their desks for the exam to begin.
The professor handed out the exams with the text facing down, as usual. Once he handed them all out, he asked the students to turn over the papers.
To everyone’s surprise, there were no questions–just a black dot in the center of the paper. The professor, seeing the expression on everyone’s faces, told them the following: “I want you to write about what you see there.” The students, confused, got started on the inexplicable task.
At the end of the class, the professor took all the exams, and started reading each one of them out loud in front of all the students.
All of them, with no exception, defined the black dot, trying to explain its position in the center of…
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