D
This animasci shows how ascii can trace a circle.
(_!_)
Types of rears




        f(x)
f(x+dx) − f(x) f'(x) = lim —————————————— dx―>0 dx



          O
         /|\
         / \
a person slashed by a slash


Math, 1+1=2
   /\
   ||
  /  \
  |  |
  |  |
  |  |
  |  |
  |  |
  |  |
 /    \
 |    |
 |    |
 /____\



a rocket flying
   *  /
 ; , |
    /
 '.|
   |
   ,\
'   /
  ,|
'  |
 ./
Rappel, you know?

       ____
     _/ . *
 ___/  ,  ;
/ .  '  ,
A test, most likely.
..........
...=-=....
..|(o)|...
...=-=....
..........
Thank you, Dave


      __  __   _                       
     /  \/  \_/ °=      
 °\/(__________/    
     /      \       
    /_       \_
A camel running