Double Delight is a very interesting set of flip-up book, written by Mary Novick and Jenny Hale / Sybel Harlin. It comes in 8 books per set.
For example, in one of the titles "Bugs", one page reads "who flutters around flowers?", when the kid flip up the page, he will see a few butterfiies (蝴蝶). In another title "Zoo", one of the pages reads "who stands on one leg", when the kid flip up the page, he will see a flamingo (火烈鸟）.
This is one of those books that kids can learn while having fun. Bilingual and is in both English and Chinese. It is in soft cover and in simplified chinese. Suitable for children from 6 mths to 2 YOs. The 8 titles in this set are:
《颜色与形状》Animal and Shapes