Im 21, i go to college for my bachelors degree in mechanical engineering, and in my spare time i surf Levels4You.com, make maps for UT2k4 or RF, model stuff in 3Ds max or other mod related things. When i comes to modding i don't really have a specific trade though i just kinda learn it as i go.
This was part of a tetris map where the blocks drop down, disappear, and then loop back around an infinite amount of times ... they were rigged in a order so that the timing is perfect.