In order to obtain good AFM results, the vibration isolation platform is needed. The vibration isolation consists of a large mass attached to bungy cords firmly anchored to the building. (Notice that the resonance frequency only depends on the stretch of the bungy cord). Damping of the oscillation is believed to result from rubbing of the rubber fibres inside of the bungy cord against the outside lining material. Between the low resonance frequency of the bungy cord system and the high resonance frequency of the microscope hardware itself (> 10 kHz ), the AFM effectively comprises a band pass filter. This allows the microscopists to safely image their samples in the intermediate range of about 1 - 100 Hz and obtain atomic resolution.