A Spirograph is a geometric drawing toy that produces intricate and beautiful designs known as mathematical curves called hypotrochoids and epitrochoids. It consists of a set of plastic gears that interlock, allowing a pen to trace patterns as one gear rotates around another. The user can create various designs by changing the position of the pen and the size of the gears. Originally invented in the 1960s, the Spirograph became popular for its ability to create complex shapes easily. It is often used in art and education to teach concepts related to geometry and symmetry. The resulting designs can be colorful and visually striking, making it a favorite among both children and adults.