Ahh, I apologize for not thoroughly reading the entire comment thread before posting mine. Otherwise I would've upvoted you and said "+1" or something to that e

Ahh, I apologize for not thoroughly reading the entire comment thread before posting mine. Otherwise I would've upvoted you and said "+1" or something to that effect. I certainly didn't mean to hurt your feelings. And also thanks for jogging my memory on the source. SICP remains one of my favorite textbooks from college, although it's been about 20 years and so everything's fuzzier than it used to be. Have a great weekend.