Tangle U was a Zentangle event in Portland, Maine by Elaine Huffman. The event was April 25 thru April 27th. We had several teachers, some with national recognition like Suzanne McNeill, Beckah Krahula and Molly Hollibaugh. The picture above is a note card. Look closely and you will see a square opening. The idea is to tangle a drawing inside the card and extend your design on the outside.
Here is a picture of the inside of the peek a boo card. You can make the card with different cut outs. I have seen a round and a heart.