If a bottle of beer is six inches in front of you on the table, your mind "sparks" a response that adjusts the amount of distance your hand needs to travel, plus the angle of approach and the structure to hold your arm where it needs to be to retrieve the bottle. If the bottle is across a 3'-wide table, your mind-intent adjusts accordingly so your body will structure/angle, power and move the arm the way it must to reach and lift that bottle.
Without an actual bottle of beer on the table, and without moving your arm, you can spark the same neural-firing that would drive the body action of reaching for a bottle of beer. In fact, you don't even have to picture an imaginary bottle in your mind; just spark the volition. When exercising intent, it actually is better not to have a "visual" picture in your mind's eye, because that's one more piece of clutter that obstructs pure thought and action.
No beer - no intent (unless there's wine as substitute)!
As to visual pictures, Pavlov's dogs have nothing on the saliva I can generate...