This simply means taking a walk and using whatever you see to trigger new associations. Certain environments can be particularly rich sources of ideas: high streets, parks, zoos, industrial areas, and so on.
A subset of the Springboard Category. There are three such subsets... Connection Making Metaphorical Pattern Based Methods of Connection Making Card Decks Force Fit Proverbs and Cliches Random Juxtaposition Random Objects Random Words Street Excursion