A circle and a point in unicode
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HTML + CSS gold circle
http://jsfiddle.net/m9TLb/1/
"A circle is a square with rounded corners"
a circle
a point
a line
all perfect
draw a straigth line and follow it
A classic:
http://www.videobash.com/video_show/teacher-draws-a-perfect-circle-389305
http://en.wikipedia.org/wiki/Circle#mediaviewer/File:Circle-withsegments.svg
Using the same tools as on paper: A cup to guide for the circle, a pen to guide for the line, smashing the pen to the paper for the point.
http://i.imgur.com/7QI1BFm.png
Python turtle module
import turtle
def circle(n,x):
angle=360/n
for i in range(n):
turtle.forward(x)
turtle.left(angle)
print circle(360,1)