The correct answer is: Glass discs.
Tikuli art is a traditional Indian folk art form that involves decorating small glass discs with intricate patterns. The discs are typically made of colored glass and are decorated with a variety of designs, including flowers, animals, and geometric patterns. Tikuli art is often used to decorate homes and temples, and it is also a popular souvenir for tourists.
Terracotta pots are made of clay and are often decorated with simple geometric patterns. Silk threads are used to make a variety of textiles, including clothing, bedding, and curtains. Bamboo sticks are used to make a variety of products, including furniture, baskets, and musical instruments.
While all of these materials can be used to create beautiful works of art, only glass discs are used in Tikuli art.