Have you been Zentangled?

Hello folks, well have you been Zentangled?  I had never heard of it until last week when I saw a fabulous card made by a fellow card maker Stella which she had used the Zentangle technique.
When I was back in my final year of school in 1974, all my projects and exam pieces were on an "Optical Art" theme!  Which today is very much like Zentangling!  So I thought I would have a go on two images of Emma Cannings which available on her CD Rom and from Polkadoodles.co.uk. I used a very fine nibbed fibre pen to do my zentangling.  I hope you like how they have turned out. I think they are rather Groovy!!