> but I can't put an empty barrel outside and have the sun fill it up with oil. Sure you could. Just place it next to the output of a solar press and extract o

> but I can't put an empty barrel outside and have the sun fill it up with oil. Sure you could. Just place it next to the output of a solar press and extract oil from sunflower seeds or others, let it pour into the barrel until full, replace with an empty barrel, and repeat. When you have enough oil stocked, you can use it to manipulate the market, make a fortune, start a war, takeover the world, eliminate borders, whatever you like, the sky's the limit with an empty barrel and a little sun.