This is the best showcase of introducing a lock to a beginner, IMO.
Very clean, no tricks, nothing to confuse, no space wasted with possibility of seducing a beginner to start wondering around. :) Just the essence of it. In this regard, 5 stars! Can't be done better, IMO.
A very good showcase of a lock, but not for total beginners. They might get confused. This is one rang higher, IMO, so: advanced-beginner, learning that sometimes it matters which way to approach a lock, first. And in this regard, I give this level 5 stars.