Shellfish matching is an elegant game that was popular among the Heian aristocracy. It is said that the aristocrats enjoyed singing by pasting gold leaf on the inside of the clam, which is a bivalve, and drawing gorgeous patterns. It has been loved since the Heian period as a lucky charm for "marital harmony" and "family safety", and the clam pattern is said to be a craft work in the natural world because of its unique beauty. We hope that you will enjoy this kind of play in the palace as a modern interior, and we have exhibited it as "Decorative Shell Matching". Clam artists, painters, and foil stampers each work in their own division of labor. It is a one-of-a-kind work of natural art.