Actually, Bill Atkinson saw the PARC demo along with Jobs, and he thought Xerox had come up with an efficient implementation for overlapping regions. This inspi

Actually, Bill Atkinson saw the PARC demo along with Jobs, and he thought Xerox had come up with an efficient implementation for overlapping regions. This inspired him to work on his own implementation for a problem he previously had considered too difficult. Only after Atkinson had finished his implementation did he learn that PARC was using a brute-force technique. (The Alto was a more powerful and expensive computer than the Lisa and Macintosh, so it could get away with a less efficient implementation.)