This is a picture of an astrid that I made on June 28, 2007. Unfortunately to make my astrid, I used alot of geometric measures by using a lot of items. It also shows perspective and proportion. They also produce certain opitical effects. This picture also shows the types of symmetry such as reflection symmetry and rotational symmetry. There are only 4 folds on my astrid that could look exactly the same shapes and sizes when being turn around so many times.