It is so graceful. The extendible arm performs movements like a ballerina extending her arm or leg. The Machine nurtures the Man when he is tired, is grumpy with him when he pushes too far, and complements his movements and intentions perfectly. It's romantic, humorous and compelling. I realise I have tears in my eyes. And the children's faces are rapt, completely caught up in the story. They cheer, applaud and smile.
And the builders stay for the whole thing.