I knew an engineer once who appeared to be extremely right brained - at least all the welders had a hard time with his 'prints. I think a certain amount of that is necessary though because there is an art to design. If you ever saw the lousy 'prints I made before computers came along when I was taking mechanical drawing in high school you'd puke.LOL  We were so bad at it that I firmly believe it was only by 'bribing' Mr. Jones with a fifth of gin that we all managed to pass the final in senior year.  (It didn't help that I'd broken my index finger on my writing hand in football practice the year before.)