Unique vs. not unique

There are six items. There are two books, one called "Persepolis", the other is called "Jerusalem". Other four items are Logitech, long eye in supy, which is a can food, type writer ribbon and Trojan horse. They are in different colors and shapes. However, five of them are related to each other and one of them is not. From the material, color and shape, I can determine with one is the exception. First, let me …

…they are eating them. You can predict people's feelings when they are using them. For the Trojan horse, you can't predict how people feel. People will have various feelings to this Trojan horse. In conclusion, from the material, color and shape, I can determine the Trojan horse is different than the other five items, which are the book of "Persepolis", the book of "Jerusalem", the Logitech, the typewriter ribbon and the long eye can food.