Ken Kesey's 'Furthur' bus has returned to San Francisco. The bus is part of a new exhibit related to the Grateful Dead.

Further details about the exhibit and the bus's presence are available from the source. The exhibit is likely to be of interest to fans of the Grateful Dead and Ken Kesey.

The source provides more information about the exhibit and the 'Furthur' bus, which can be accessed for those looking for additional details.