If you want to put together an Ikea chair, everything is in the box and the instructions are two pages long. If you want to put together a chair from scratch th

If you want to put together an Ikea chair, everything is in the box and the instructions are two pages long. If you want to put together a chair from scratch then you need the wood, hammers, nails, saws, a lathe, sandpaper (in multiple levels of coarseness), glue and a number of other tools. React is a lathe in this example, it's hard to put it in context without the rest of the tools but that doesn't make it complex.