Steve writes “I was reading an old 1950’s “how to” magic book for kids that described a trick that required a small round piece of glass. It suggested that I could make such a piece of glass by cutting the glass into a circle with ordinary scissors. How? By doing the cutting in a sink filled with water. A quick search on google and sure enough, some interesting information on the subject. I thought Make: blog readers might find this interesting–even if it doesn’t work as well as advertised.” Link.