After a couple weeks of studying CSC104, I find the course become more and more interesting. Now I am able to create a complex image by using a simple image and the functions I learnt from the class. I used to think that these images can only be created by Photoshop. However, by using DrRacket, I am also able to type in some functions and eventually create the same image. I am really enjoyed when I can make these images by typing functions. By getting more familiar with the functions I have learnt, I find it easier to deal with the quizzes and even the test. When I just started to identify the errors occurred in some specific functions, it seemed to be hard for me; for example, the “map” and “apply” functions cannot be used without a list;