Why Do Tractors Have Such Big Tyres? is a colorful book for early readers which answers classic unanswerable questions small children ask about machines, such as Why do tractors have such big tyres? Why do some planes leave a long, white trail behind them when they zoom through the sky?
The first answer is a fantastic, imaginative one, that a child might think of, such as Is it so they can crush the other machines on the farm? Or, Is it because they are trying to make a path to find their way back home? Then a factual, simply stated answer is provided, prefaced with, No, thats silly!