A DIY Mid-Air Pointing Device 75
Werner Heuser
writes with an article in Linuxdevices on building your own handheld
pointing device that works in mid-air. There is a YouTube video
showing the Soap in action and detailed instructions to make your own
Soap. From the article: "'Soap,' which resembles a bar of soap,
is based on hardware found in a common wireless optical mouse, and is
relatively easy to make, according to its inventors. Imagine numerous
situations in which one might wish to control an appliance while
standing or walking, for example, when giving a slide presentation or
interacting with a wall-sized display."