There are some laptop computers like the Lenovo Yoga that allow you to rotate the screen more than 180 degrees and use it on a surface in "Tent Mode".
Handy for presentations, watching videos or using as a second monitor. This mode puts the normal image upside down, so it needs to be flipped for viewing.
This script, flip-display.sh, gives you a small GUI to do the flipping in Puppy.
Edit: Also could be fun on a normal computer to flip it and wait for someone to discover or give your brain a little exercise when trying to flip it back to normal (right is left and up is down)
wizard