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Anything that has multipleAnything that has multiple points of contact with a hard surface should be able to be balanced and be freestanding. A broom with hard bristles should be easier to balance than one with soft pliable bristles. Also, the juxtaposition of the handle to the bristles can make a difference but should be able to be overcome. I fail to see the sun's affect on this issue except if its done outdoors and the heat of the sun softens the bristles. You also have to factor in air movement and direction in order to overcome the effect this may have on the freestanding broom. The story of the broom levitation is remarkable, if true, but I also wonder what he was smoking at the time.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?