Great conference on a rainy Saturday

I brought my knot theory students to our regional meeting of the MAA today (the EPaDel section). It was one of the best EPaDel meetings I’ve attended. There were parallel talks, so it was hard to decide who to see. I decided to watch the student talks in the morning and the invited talks in…

Ambigrams

John Langdon is a typographer who has become famous for his ambigrams. An ambigrams is a word or words that has some sort of symmetry, frequently a rotational or mirror symmetry. Langdon’s work became well known after it appeared in Dan Brown’s best-selling novels The Da Vinci Code and Angels & Demons. Apparently Brown named…