Since the CS5 version of Adobe Illustrator, the Adobe team incorporated a new tool known as the Perspective Grid, this tool allows you to easily create artwork in different perspectives, essentially when you start creating vectors on your Adobe Illustrator Artboard they will stick to the perspective planes, it is really good at showing items disappearing in to the background. With the perspective grid tool in Adobe Illustrator we have  three vanishing point perspectives and you can draw directly on to each one. To activate the Perspective Grid simply click in View...