When an inventor comes up with a truly novel idea or insight, he or she has been exploring relationships, patterns, and associations until a productive interplay of ideas, images, and data of all kinds is found. That encouragement signals the brain that the chase is on. The mind is to be projected to a special little world encompassed by this project.
Einstein placed himself in speeding trains, moving clocks and elevators in space. This was more than metaphorical thinking; it was a mind transforming itself to another place. Einstein's strength came from his imagination and creativity.
My father, Peter Kilham, invented a phenomenally successful bird feeder that is the very familiar plastic tube with metal perches. He started by imaging himself to be a bird on a perch. Then he envisioned a geometry that would be most accommodating to the bird. Only after the bird was satisfied did he select the materials and manufacturing processes to make an attractive and economical product.