Mental images, accompanied by strong emotion, are blueprints therefore upon which a corresponding physical object, or condition or event, will in your terms appear.
The intensity of a feeling or thought or mental image is, therefore, the important element in determining its subsequent physical materialization.
If your turn of mind is highly intense and you think in vivid mental emotional images, these will be swiftly formed into physical events. If you are also of a highly pessimistic nature, given to thoughts and feelings of potential disaster, then these thoughts will be quite faithfully reproduced in experience.
The more intense your imagination and inner experience, therefore, the more important it is that you realize the methods by which this inner experience becomes physically real. Your thoughts and emotions begin their journey into physical actualization at the moment of conception.