This DIY concrete outdoor sink is cast entirely using an inflatable kiddie pool as the outer mold and a large yoga ball pressed into wet concrete to shape the interior basin. After the concrete cures, the ball is removed and the inflatable pool is peeled away, revealing a solid three-ring concrete basin. A drain hole is drilled through the base, and the finished piece is mounted on a rustic stone pedestal with a brass outdoor faucet. The result is a weather-resistant, hand-crafted outdoor sink that looks custom-built for any backyard garden. Watch to the end for the full reveal.