Per-i-Sight: MacBook iSight Periscope

Step 5 Trim the mirror

your mirror may be like mine: way too big. the mirror pictured is actually big enough to make four Per-i-Sights.
If you would like, mount the mirror, turn on Photo Booth and using a Vis-a-Vis mark where the tip of the pen enters the image.
draw a few lines on the mirror, slice it up, make some more cardboard brackets and tada! you have a few backups or some for your friends!