In 1960s, concern about inadequacies of mental hospitals, and ability of antipsychotic drugs to normalize patient"s behaviour, led to movement to transfer primary focus of treatment from institution to community established. Psychiatric units were added to many hospitals and community services were. Revolving door phenomenon patients respond well to medication in hospital, and are soon released into a community that cannot offer them care they require, and then are sent back to the hospital. Preventing development of disorders is preferable to successful treatment. Situation-focused prevention directed at reducing or eliminating environmental causes of behaviour disorders or at enhancing situational factors that help prevent the development of disorders. Competency-focused prevention designed to increase personal resources and coping skills. Experience light waves as brightnesses and colours, air vibrations as sounds, chemical substances as odours or tastes, etc. Experience sound as colours, taste as touch sensations that have different shapes, etc.