Feeling fidgety? Attend this Medford Public Library workshop for adults on how to make a thaumatrope, or a spinning optical illusion, and create your very own optical illusion fidget toy. The thaumatrope optical toy was popular in the 19th century. A disk with a picture on each side is attached to two pieces of string. When the strings are twirled quickly between the fingers the two pictures appear to blend into one. Register for this workshop through the library’s online calendar.