The piece dates SCAN to a 1961 patent: ride to the top, reverse, collect everyone on the way down. LOOK stops at the highest floor actually requested, which is the behaviour you already expect from a lift. Both run live in the page at 1×, 5× or 25×, and a button drops five fresh calls into the shafts so you can watch the assign-it-to-the-nearest-car rule come apart in front of you.