 The materials for the vases range from bronze to both glazed and unglazed ceramics as well as bamboo, glass and other materials.An important concept in "chadō" is the distinction between "shin", "gyō", "sō", which may be rendered as "formal, moderate, relaxed", a distinction which informs every aspect of chadō.If the space where the tea gathering is taking place is a formal venue, such as a large "shoin" style reception room, then the "chabana" suitably should be in a formal vase or basket.