Since tai chi can be considered a complex form of qigong, the four tools that we use in qigong are also the tools utilized in tai chi. Many teachers and masters call these tools by various names: baskets, rivers, and other analogous terms but the tools themselves are all the same. Regardless of the style, tradition or lineage of a tai chi or qigong practice, they all share the same four tools: Breath work, Specific Positions, Visualization and Self-Massage. Some techniques utilize all four tools at once (like DaMo's 18 Muscle/Tendon Changing Classic). Other techniques utilize only one of the tools at a time (like Shi Shi Hu breathwork). Any combination of these four tools is possible within the various systems of chi arts.