Recursion is like a animation, fun!!!

This Tuesday, Prof. Heap gave us a handout to do some practices about recursion. Throughout the whole exercise, I only had two basic questions, but both of them got solved after that lecture. The first question is the term "outline". I do not understand it because for those exercise we did before, we always provide a shape with "solid" as a term to describe its property. But at this time, we got "outline", and I start feel confused. However, after I asked Prof. Heap, he told us "outline" means a shape only contains the outline but not a solid one, it is an empty shape. And the other question is that I do not understand what "below" means, and I thought below means put every thing in order in a vertical line, and the later one is below the previous one. But I found I was wrong, below means put every item in one horizontal line, but start from bottom of the previous one. So I really feel I learned a lot of things.

And because of that lecture, I really get interested in recursion. In this class, I got some amazing pictures:

For the first picture, it is like a maze!!! From creating this picture, I start to have the thought of making a real maze by using recursion. I know the process will be really complex, but I still would like to have a try first, and if I can figure it out in the future, I will definitely post online to show everyone my own maze!

And for the second one and the third one, they are both symmetrical. For the second one, we can use this kind of knowledge to create accounting table or other kinds of tables for calculations, ect. So it is very helpful. For the third one, it looks like a snowflake, and it also has a nice name related with "snowflake."

But unfortunately, I did not remember the the whole name of that shape. But for this shape, we can use it as decorations in this society, and it can make our life more colorful!!!

I really hope I can know more knowledge of recursion, and then I can create more beautiful things and make my world more fun!