Webdriver Torso is a YouTube account that posts mostly 11-second videos consisting of blue and red rectangles that change position, accompanied by a series of bleeps which change in pitch. As of September 2015, it has uploaded over 390,000 videos, and more than 70,000 people have subscribed to the channel. Though initially a source of speculation for viewers, YouTube has humorously acknowledged that the channel exists as an internal testing utility for YouTube's performance.