Gotcha! You thought I was referring to an insulator. This is an art glass paperweight that my sister brought back for me from one of her trips. With all the discussion about teal green and blue, I figured this was a good time to post it. It also has red on part of the swirly center. As you can see in the pic, it isn't just insulator makers that have trouble with bubbles in the glass. This one has a couple of nice bubbles twisted around the coloured swirls.