Detailed Description This set of 84 photo cards is used to teach how to match identical and non-identical items, as well as how to categorize. Each set contains 4 cards with 2 identical and 2 non-identical cards in each category. For example, in the category of dogs, there are 4 photos of 3 dogs, with a duplicate of one of them, enabling the child to generalize the concept of dog. Other items include babies, balls, telephones, ice cream and cars, among many others. Each card is 2.5" x 3.5".