Today’s catch is four things nobody needed built twice: a Velázquez repainted stroke by stroke inside the Met, the Wolfram Language written again from scratch in Rust, a distributed-systems textbook redrawn as comics you can push until they break, and a kitchen blender’s motor replaced with a running V8. In three of them the second build is how you finally see the first one — in the fourth it is four horsepower and a smoothie.