Perfectly balanced helium balloon + electrostatic attraction = Levitation
This effect was noticed accidentally. We’d come back from a meal out with a give away balloon. The balloon wasn’t designed for helium and so there was a slow leak through the rubber. It wasn’t long before the balloon started to lose it’s buoyancy. For a few minutes the balloon was in the sweet spot of hovering mid air – neither going up nor down. At this stage the effect of electrostatic attraction was quite noticeable.