It’s the holiday season and people everywhere are wishing they had the power of invisibility.  Just imagine what you’d overhear at the office holiday party if you could mingle with your coworkers sight unseen!  You might also wish to disappear from time to time during Christmas dinner, in order to prevent being cornered by Aunt Sally or a similar relative given to detailed descriptions of bunion surgery and reports on the latest arrests and obituaries.  And maybe the power of invisibility could extend from people to objects; what would life be like if you …