I've looked at clouds from both sides now. And seen lots of strange shapes in them. Here is a collection of 30 odd cloud photos that look like "something" -- the eponymous "pig with six legs" is clear (but unfortunately does not get an internal page uncluttered with text, so don't lose the dust jacket!), as are many of the others, although I had a problem interpreting a few of them. Best is to look at the photo first, see what you think it looks like, then read the caption, and look again. Sometimes I could see it without the caption, sometimes only with (but then surprisingly clearly), and sometimes not at all. The go to www.cloudappreciationsociety.org for more photos, most just of clouds.
I maybe wouldn't pay full price for this (£10) but there are much cheaper copies available. A good present for someone who has books about everything, even roundabouts.