Their acting skills had to go with their vocal perfection. They specialized in the roles of the king, the queen, the guard, and the tea-boy. That’s all. The opera director wanted to adapt Shakespeare into an opera setting, so they developed a list of major characters. Most of their plays were based on four characters. All other people in the plot were mentioned in a dialogue projected on the backdrop, in a photographic form or as movies that were recorded for battle scenes brought from major movie productions. There were also other projections used, of people eating or dancing. It all worked, but the stage was still three-dimensional. This is when they decided to bring in the robots. They were called Papero I, II, III, etc. They looked like people and could follow the paths precisely. Paperos could change the display of they costume in seconds, to say nothing about the tone of their voice, the language, and all the facial expressions displayed on their current mask. Now, on the top of remembering their role and acting patterns, the singers had to learn the robots’ trajectories. The following year they plan to add virtual reality floating objects set between the rows, allowing the audience for interactive learning experience in the opera house.