⬡ Swimming Duck

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

— from HN comment

1. I believe this to be an excellent ◊ design pattern for ⌣ interface design
   • don't expose your inner workings to the user
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