Make a Sprite
With four sides your sprite moves more realistically and your project becomes more refined.
http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CBsQFjAA&url=http%3A%2F%2Fscratched.media.mit.edu%2Fsites%2Fdefault%2Ffiles%2FLearn-Scratch-Lesson-1.pdf&ei=I_GsU-2sMIr28QWGioHYAw&usg=AFQjCNGHL7zx6N7zhhP6tiFTOTNVXJPLRg&bvm=bv.69837884,d.dGc
http://www.google.ca/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CBsQFjAA&url=http%3A%2F%2Fscratched.media.mit.edu%2Fsites%2Fdefault%2Ffiles%2FLearn-Scratch-Lesson-1.pdf&ei=I_GsU-2sMIr28QWGioHYAw&usg=AFQjCNGHL7zx6N7zhhP6tiFTOTNVXJPLRg&bvm=bv.69837884,d.dGc