They are a very powerful development in the history of sigil magic, which dates back to the first bison drawn on the first cave wall. The logo or brand, like any sigil, is a condensation, a compressed symbolic summing up of the world of desire the corporation intends to represent. The logo is the only visible sign of the corproate intelligence seething behind it. Walt Disney died long ago but his sigil, his cartoonish signature persists, carrying its own vast weight of meanings, associations, nostalgia and significance. People are born and grow up to become Disney executives, mouthing the jargon and the credo of a living corporate entity.
Corporate entities are worth studying.
They and other ghosts like them rule our world. Watch their habits, track their movements over time, monitor their repeated behaviours and watch how they react to change and novelty. Learn how to imitate them, steal their successful strategies and use them as your own. Create your own brand, your own logo and see how quickly you can make it spread. Build your own god and set it loose.