Wild Videos on Instagram: "This clip breaks down one of the smartest low-tech designs you’ll ever see — a house gate that locks itself automatically without a single wire, battery, or switch. As the gate swings shut, the system uses pure mechanical engineering: gravity pulls the latch into place, leverage aligns the lock, and the closing motion activates the catch. No electronics to fail, no sensors to repair, and no maintenance beyond keeping the hinge clean. It’s a perfect showcase of how simp