Coincidentally, on a weekend afternoon, driving south of San Diego near the border of Mexico, I suddenly found a fence and door that made me feel incredible. The fence of this house is very low, and walking in the middle of the aisle between the yard and the house, there is a security door! From the perspective of the construction of the small villas, the low-income families, the grass of the yard has not been trimmed and confirmed my guess about the economic conditions of the family (usually the wealthy families in the United States will trim the shrubs and lawns themselves). Out of curiosity, I pressed the doorbell. Although this fence is only halfway high, I don't even have to pass through the door. I can sneak into the yard and enter the master's "territory."