Crystal therapy, also known as crystal healing, is a form of spiritual healing similar to Reiki. During a session, clients will typically lie face up, fully clothed, whilst small crystals or gemstones are placed on or around their body. At the same time the therapist guides the client using meditation techniques or visualisations. Clients frequently experience feelings of relaxation and deep rest during treatment. No previous knowledge of crystals is required of the client, simply a willingness to relax. Treatments last for one hour.