⁓ build Swimming Ducks

It looks smooth and calm, above water, but is paddling like hell, underneath.

— [from HN comment](https://news.ycombinator.com/item?id=28511881#28526463

1. I believe this to be an excellent ◊ design pattern for ⌣ interface design
2. examples:
   1. a file conversion terminal command that looks like convert img.png img.jpg but underneath has crazy complex standards glue code
   2. a modern car