The playwright wants to illustrate fear to the audience because they fear the anger of Dryas and so he was put into prison for that reason, but maybe sadness as well because of the reason he was send to jail.
The main idea is that humanoid robots do things for the scientists that the never could.
Okay so i found the answer on Answers.com so this is just a guess, but here it is. "<span>A poster with kitchener pointing on it saying "The army needs you".</span>
The answer to this would be a serious tone
hope this helps
