We seem to be still in the deliverable business.

“Creating a prototype as a final deliverable allows for greater interaction with the product and a deeper-level understanding of how the product is experienced. It can also easily be adopted for usability testing and iterated on quickly and efficiently to push out new versions. Prototyping is also an impactful way to present to your client. People know how to interact with products. Demonstrating interactions with a prototype helps to spark well-informed discussions with clients and can lead to better design more quickly.”

(Ian Schoen a.k.a. @icschoen ~ UX Magazine)