The Grateful Dead bear, the one that’s usually found dancing across tie-dye T-shirts, bucket hats, and the bumpers of cars, is a core symbol of free-wheeling, acid-laced 1970s spirit.

You can see it now in your mind’s eye. Yes, the famous Grateful Dead bears. The American rock band known as The Grateful Dead was formed in 1965 in Palo Alto, California, not far from San Francisco.