Thanks for the eye-witness info. The need for the actor/actress to remain frozen in position so as not to extend parts of their body outside the perimeter of th

Thanks for the eye-witness info. The need for the actor/actress to remain frozen in position so as not to extend parts of their body outside the perimeter of the screen explains the wildly exaggerated facial expressions (including Stepford-y smiles so wide that I'm pretty sure that I saw some wisdom teeth) of the actress-playing-avatar in the video embedded in the linked page.