Even Rube Goldberg sometimes included a simple alternative at the end of his machines. If the opossum or woodpecker get sick, there is a knife handy to sharpen

Even Rube Goldberg sometimes included a simple alternative at the end of his machines. If the opossum or woodpecker get sick, there is a knife handy to sharpen the pencil. https://msl.cs.uiuc.edu/~lavalle/cs397/goldberg.html https://msl.cs.uiuc.edu/~lavalle/cs397/goldberg.html