Answer
The possible interpretations for one section of the drawing do not match any of those of another section. To embed this insight into a program, you might isolate the interpretations allowable for various line junctions and then write a program that tries to find a set of compatible interpretations (one for each junction). In fact, if you stop and think about it, this is probably what your own senses did in trying to evaluate the drawing. Did you detect your eyes scanning back and forth between the two ends of the drawing as your senses tried to piece possible interpretations together? (If this subject interests you, you will want to read about the work of people such as D. A. Huffman, M. B. Clowes, and D. Waltz.)
Work Step by Step
The possible interpretations for one section of the drawing do not match any of those of another section. To embed this insight into a program, you might isolate the interpretations allowable for various line junctions and then write a program that tries to find a set of compatible interpretations (one for each junction). In fact, if you stop and think about it, this is probably what your own senses did in trying to evaluate the drawing. Did you detect your eyes scanning back and forth between the two ends of the drawing as your senses tried to piece possible interpretations together? (If this subject interests you, you will want to read about the work of people such as D. A. Huffman, M. B. Clowes, and D. Waltz.)
