@MoonGal thank you, I do enjoy tatting, took me quite the time to finally 'get it' though. 3 days in front of my pc going over and over and over - many tears and much frustration, then it suddenly clicked. 
Back again @Bunniekins with some images of things I've done and the type of tatting shuttle I prefer to use. There are other styles, but I work best with the replaceable bobbin style, and with the wee crochet hook on the end for easy joining to picots.
The other style looks similar but you wrap the thread around a centre post and it 'clicks' between each of the downward facing ends of the shuttle which has always affected the quality of the thread for me. There are lots of pretty shuttles out there too.
Tatting consists of making what are 2 knots, one following the other, with one thread onto the other thread. One knot goes in one direction, with the following knot going in the opposite direction. The knot has to slip along the thread it sits on to enable the tatting to take place. So while the knot is, in effect, a macrame knot, it must be done in such a way that slipping along the thread occurs.
Tatting can be done with a needle, I recently purchased tatting needles to learn this method.
1 Shuttle or 2 shuttles, or 1 shuttle in conjuction with yarn from the ball may be utilised to create tatting lace. There are a bazillion gazillion patterns available (the Antique Pattern Library is an amazing resource for pretty much ANY patterns for anything you can think of and is free).
Thread of varying thicknesses are used, but mercerized is the most effective so the itsy bitsy fluffy bits don't catch and ruin the slippage along the threads.
There are videos explaining how to hold the thread and shuttle but I could not get the hang of the traditional way so devised my own and have taught a number of ladies who could no longer use the traditional method due to arthritis etc how to adapt. The joy in their faces when they did it brought tears to my eyes I admit.
Thank you for asking @Bunniekins, going over my things has inspired me to make the blouse that I have the fabric for to go with the tatted button holes! Those are made from Rayon thread, lovely, lovely shiny finish, but a beast to work with in any craft! I love it so I persevere.
Okay, image time.
