The document discusses the concept of "Ba", a shared space for knowledge creation proposed by Japanese philosophers. It provides three types of Ba - physical, virtual, and mental. Ba exists at different levels from individual to organization and beyond. Knowledge is also categorized into explicit and tacit forms. The SECI model is presented as a framework for knowledge conversion between tacit and explicit through socialization, externalization, combination, and internalization processes. Examples of companies applying Ba concepts such as dedicated teams and cross-functional groups at Toshiba and Maekawa are outlined.