Even non-magnetic materials exhibit magnetic behaviour under the influence of a magnetic field. This property, known as diamagnetism is actually a kind of anti-magnetism because the induced field opposes the surrounding field and repels both poles. Diamagnetism is usually very weak but in a field of sufficient strength (10 Tesla or more) it is sufficient to cause small objects to levitate.

The effect can be further amplified to enable the levitation of rocks by bathing the subject in liquid oxygen (although this is not really recommended for home experimenters).