So just to be clear, I didn't just sit there and spout "Ruby! Wordpress! Html5!" and wait for them to give me a cookie. Obviously they want to try to find out i

So just to be clear, I didn't just sit there and spout "Ruby! Wordpress! Html5!" and wait for them to give me a cookie. Obviously they want to try to find out if I can solve their problem. But when they say "I want a slider that shows the part being taken apart and put together," they don't need wireframes, they need to know that I can translate their "vision" into code. I can talk about canvas and JavaScript APIs and whatnot, but I might as well be talking about klurblats and snorgflerms, for all they know. They have no way of evaluating whether I can turn their vision into code, unless I have done something else exactly like it in the past. So my question is, on what basis are they making their decision? Gut instinct? Or are they just likely to wait around until they find somebody who can point to a project exactly like theirs?