If you lie down in a field of cabbage, potatoes or even onions, you will disappear completely.Have you lived near or driven past farmland before? Most non-grain crops are relatively short compared to an average human & around knee height or less. F/ex Tomatoes, cotton, potatoes, lettuce, cabbage, cucumber, onion, brussel sprouts, carrots, pumpkin, etc are all examples of these short crops. It's not until you start getting into grains (wheat/corn/etc) where the crops start getting much above knee or maybe waist high, Even then wheat is only going to be about 2-4 feet tall (oats too). Farmers like being able to see across a field to make sure herbivorous animals like deer are not eating the crop, not every crop can be expected to grow several feet tall like corn.
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