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I'm not sure if it is mandatory, but I just had to make one for the fun of it. :) Incidentally, the antennae are hairs from my 80lb dog. He was not best pleased at being plucked! (Blue-Bot has had some paint (well, felt tip) since the video)
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/i-suppose-every-newbie-must-make-one