Levitation is a capacity available to entities in the 4th Density. Basically, this is an ability tied to the mental powers of those in 4th Density. As earlier stated, 4th Density intelligence is much higher than 3rd Density, and not only as measured by IQ. The 4th Density entity can focus gravitational bearings, such that objects, including the self, can be floated. This is simply a convenience used, much as you, in the 3rd Density, take for granted the ability to control the temperature of your living rooms.