Did you ever get I-Spy books ? I got one every time we went on holiday, I suppose the intention was to keep me occupied on the coach journey from Birmingham to Cornwall. Or maybe for something to do on rainy holiday days. Whatever the reason I loved them. The system of ticking off things you'd spotted appealed to my sense order and organisation. I remember vividly how agonising it was to choose the book I wanted, there was a lot of choice covering all sorts of topics. Some were quite specialist too. If I remember rightly, the books were soft covers and the paper was not good quality. But what would you expect for 6d? I like the design of the two above vintage book covers. Tells you all you need to know about what the book's about at a glance.
Think the books are still available, although the covers are different, And I think there's an I-Spy App - no surprise. At least it might teach young children something. Viv.