{{|
'''I make mistakes all the time. how can I(we) do better?'''
|}}

==== 20일 ====

from http://just.letterror.com/ltrwiki/DrawBot

http://donghee.byus.net/p5/GoldenSection/

http://donghee.byus.net/blog/1
 http://donghee.byus.net/p5/Galilei/