The Façade pattern

“Ugh!” Phoebe exclaims. It’s 4 a.m. at Phoebe’s workshop. Her formerly white lab coat is covered in grease and she’s wading through aluminum shavings shed by an industrial lathe. She’s trying to build one of her robotic arms. She has several different designs, but this one is a heavy model that’s bolted to the floor. There are three variations of the arm. One arm is equipped with a welder used to weld the aluminum alloy bicycle frames together, another one has a buffer used to perfect the finish on the bicycles after they are painted, and the last one is equipped with a gripper used to hold the bicycle during assembly. Phoebe wanted to build several arms of each type. She was constrained by her budget and could only afford to build 10 arms. She decided the best combination for the arms would be three welders, three buffers, and four grippers. After whiteboarding the process, she realized her factory would not...