"This video shows how to draw a room using one point perspective. To make it more interesting, try placing your vanishing point somewhere else instead of in the centre as illustrated in this video: http://www.youtube.com/watch?v=7ZYBWA-ifEs.
Skitch was used to draw the picture with SnapzPro to screencast. The video file was then imported into iMovie to add the titles, music and narration."http://www.youtube.com/watch?v=Xv1LFjApbKk
