Image from streetmatt
The Harvard Business review has a a great example:
Image-based words have also been used to spark revolutionary moments in business: think of Bill Gates's vision of a world with a "computer on every desk and in every home".
Paint a picture with your words to capture the imagination of the people you're speaking to. They will more easily be able to see how your idea can come to life. This may seem easy, but if you're not used to speaking in this way you'll have to make a conscious effort.
People Remember What You Say When You Paint a Picture [Harvard Business Review]