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Rat-O-Matic and Whack-a-Rat

Here we show how rats made of brushes can go like rat up a drainpipe. First is Whack-a-Rat, where a brushy rat is persuaded to go up a drain pipe by whacking the pipe with a hammer. He uses friction and inertia, so he goes up with a slow movement, but doesn't go down with a sudden movement. Then we have Rat-O-Matic, who crawls up drainpipes of his own accord. He relies on the friction of squashed brushes being different in different directions.