Light painting example with max msp-jitter. At the edge of the stick there are 4 infra red leds hidden, the camera reads their coordinates, and orders jitter to produce a line starting from that point. All parameters of the line weight-height-color and life are controlable. another example using the same infrared tracking you can se here http://www.vimeo.com/9518872+ More details
What are Tags?
Tags are keywords that describe videos. For example, a video of your Hawaiian vacation might be tagged with "Hawaii," "beach," "surfing," and "sunburn."