It's a sunny afternoon, and you want to hang your recently washed clothes(shirts, trousers, shorts etc).
There are 2 identical trees in your yard,both having 10 cm diameters of bodies and they are 4 meters apart from each other, and you want to hang your clothes between them.
You have infinite amount of ropes, each having 2 meters of length.
Trying to use as few ropes as possible, exactly how many ropes do you have to use, without doing any harm to the clothes( don't let them fly away with the wind, don't let them to have stains,dirt,mud etc.)
Edit 1: 3 is the most rational answer. However i should stress this out:
Trying to use as few ropes as possible without doing any harm to the clothes