I tried to view all six of Don Firth's illustrations. For some reason, I get a "not found" message for Clickies #3 and #4. I was able to see the other four photos, and tried several times to click my way to the missing two, but failed repeatedly.

I'm very puzzled to see that someone else (Helen, above) was able to view #4, and to enjoy it enough to post a response. Makes me that much more curious, and more frustrated, at not being able to see it for myself.