Marit ha’ayin – appearance of impropriety. If Sages prohibit something due to marit ha’ayin, it is prohibited even in private when the public cannot see. Like dryhing wet clothes on Shabbos. Exceptions. False tooth. Gold tooth. Coin in sandal on Shabbos. Coin as fastner to a cloak. Head covering in an Arab country. Strings in pierced earholes. We are not concerned that a woman will remove an accessory and come to carry it in the public domain if it makes her look less appealing when removed.