Just signed out of Gmail and was prompted to check out a new feature in beta called Gmail Motion.

Gmail Motion uses your computer’s built-in webcam and Google’s patented spatial tracking technology to detect your movements and translate them into meaningful characters and commands. Movements are designed to be simple and intuitive for people of all skill levels.

Head over to the elaborately detailed website Google has dedicated to this fun prank. There you’ll find more information about the technology behind Gmail Motion and hear what a “paralanguage expert” and “movement specialist” have to say about it. In due time, the search company plans to expand Motion into Google Docs (creating a pie chart is a riot).

Update: Looks like Google’s pulling a handful of pranks this year. Hop after the break to see what they’re all about. Continue reading April Fools, 2011 edition: Google kicks things off with Gmail Motion [Update: And oh so much more] →