Popular everywhere - these can be drawn using chemical symbols of the elements as shown in the one direclty below which first appeared in the USAWeekend Magazine on December 16, 2001.- for Xmas - '5 golden rings'
The other three shown on this page were drawn by my level 1 chemistry students at Cheshire High School. can you figure them out? Hint - they say something chemical or use chemical symbols to make a statement. To find the author go to the 'who did it' page.