these activities may be useful for students to construct transformation, reflection and rotation concepts. in the class it may be difficult to show how to get reflection of an object on the board just by drawing. therefore we can make these activites in the classroom to demonstrate logic of these concepts by using technological tools.

I think this video is good example for us to care about students' interests. knowledge is same since existence, however time is changing and so students' interests. we should catch the time as a teacher.