if I went to draw a rectangle that is 50 pixels tall and that is twice as wide as
it is tall
how would I programmed the computer to do that well I could tell the artist to
go up 50 turn right and then go over 100 and move the whole thing twice but then
i'm doing the math for the computer multiplying 50 x 2 in your head may not
be that hard but computers are really good doing that so we should leave it to
them whenever possible if I just use the variable called height instead then I
could easily change height 250 and then change my algorithm to tell the artist
to go up by height turn right and then go over x height x 2 which gives us a
rectangle that is twice as wide as it is tall