I will try to answer the question in the context of this video, but I believe that this can be applied to all of the videos that we post on our website. In order to make something work, we work hard to see that it works, and when it works, it works well. As for Atlas, most of the robot control existed from previous work we did, like what we had done with parkour, which prompted us to go down the path of using model predictive controllers that take dynamics and balance into account when controlling the robot. On the robot, we were able to execute a set of dance steps that the dancers and choreographer had mapped out offline in consultation with us. It took us a long time, months, to come up with the dance, compose the motions, and iterate in simulation for many months before we finished. We even decided to upgrade some of Atlas' hardware so that it would be able to handle dancing more effectively, as it requires a lot of strength and speed. The amount of movement and speed that you have in dance is incredible, even though you might think that parkour is more explosive-although you think that parkour is way more explosive-the amount of motion and speed that you have in dance is absolutely incredible. It was also necessary to create the capability in the machine to go along with the capability in the algorithms over the course of months; and that took a significant amount of time. We only filmed for two days once we had completed the final sequence that you see in the video, and that was it. We spent quite a lot of time during that process figuring out how to move the camera through a scene with many robots in it so as to capture one continuous two-minute shot, and even though we ran and filmed the dance routine many times, we were able to repeat it quite reliably. The opening two-minute shot did not have any cuts or splices in it at all.  As a result of some hardware failures, some maintenance was required on our robots, and there were some instances in which our robots stumbled and fell down. There is no promise that these behaviors will be productized or that they will be 100 percent reliable, but they are certainly repeatable and are definitely repeatable. We try to be honest in showing things that we are able to do, not just snippets of things that we have done over the years. The truth is, there is a certain level of honesty that is required when you say that you have achieved something, and that is definitely an important factor for us.