Structured practice in visual discrimination and perception! ......The 25 lessons in this unit take children a step beyond simply differentiating between �like� and �different� objects by requiring them to specify HOW two objects are similar and different. ......This extra step helps children begin to recognize and put into words the characteristics they observe. ......Visual clues are used for students to compare....... Example: An image of a calendar and a drawing of a clock are shown. �How are these alike? How are they different?� Grade(s): 1-3.