> You acquire that skill which is indispensable to all artists and entrepreneurs: the ability to switch back and forth in your imagination from your own point o

> You acquire that skill which is indispensable to all artists and entrepreneurs: the ability to switch back and forth in your imagination from your own point of view as writer/painter/seller to the point of view of your imagined reader/gallery-goer/customer. That's pretty similar to the API design, where you have to switch rapidly from the point of view of implementer to the point of view of user and back again.