So, what if you want to fly somewhere and you aren't allowed to carry knitting needles onto the plane? Or you have to visit a courtroom for some reason - same thing - nothing pointy. Whatever will you do with your empty fingers?
Be smart and carry a couple of skeins of yarn in your tote bag. Finger knitting to the rescue!!
When I was young, I learned how to finger knit using a figure 8 wrap around the four fingers of my left hand. After two rounds, you lift the lower loop over the upper loop and over the fingertip. The strip of knitting flows down the back side of your hand.
Today when I was looking up information on finger knitting, I found at least two other ways to wrap the yarn. One is an e-wrap. You wind the yarn clockwise around each finger making sure the yarn going between the fingers is in back of the hand.
A third way is to do the figure 8 wrap for the first round. Then carry the yarn in front of the fingers above the lower loop. Without twisting it around the finger again, simply lift the lower loop over the yarn. The lifted loop will stretch the yarn to the sides of your fingers. Keep the yarn slack so you don't cut off circulation.
So what do you do with the lengths of loosely woven yarn? If you make one, you get a scarf, headband or belt. If you make several, you can twist them together, braid them or sew strips into almost any size. You can coil them into circles or ovals to make rugs, placemats, and hot pot mats. Your imagination is the limit.
If these instructions aren't as clear as you need, or if you want a visual example, put "finger knitting" into a search engine and you'll find a number of excellent helps.
Evergreen Indiana has two books on finger knitting by Katsuno Suzuki. You'll have to put them on hold, but they should arrive inside of a week or two.