This is an introduction to reverse twist cordage.
Normally, you would take a bundle of fibres between your hands and twist the right hand away from you (the top of the ply away from you). This tightens the bundle. Keep twisting until the ply kinks as shown.
Take this kinked ply between the thumb and forefinger of the left hand and orient the fibre as shown, one ply above the other, loose ends towards the right hand side. In order for this to display better, instead of kinking a single strand and proceeding from there, I used 2 different colour jute cords and tied the ends together.
Grab the upper ply (red) between the thumb and forefinger of your right hand. Proceed to twist the upper ply away from you (the top of the ply, that is). This tightens the ply.
Continue turning your right wrist around so that you can capture the bottom ply between the forefinger and middle finger of your right hand.
Twist your right wrist back in the opposite direction which reverses the position of the 2 plies. The black now becomes the upper and the red, the lower.
Now slide the left thumb and forefinger to the right to secure the new junction of the red and black plies.
Release the 2 plies from your right hand and regrip the upper ply (black) between the thumb and forefinger of your right hand. Repeat the sequence.
Continue until you reach a point where you can feel one of the plies getting thinner - the black in this case.. At this point, take a small amount of new fibre (brown) and lay it on top of the ply that is getting thinner (black) allowing a bit of the new fibre to hang over the main cord
Regrip the red/black/brown junction with your left hand. Grip the brown fibres and the thinner black ply as a single unit with your right hand and twist away from you as in the previous actions. Come around and capture the lower ply (red) etc. The 2 plies, now, are the red and the black/brown. Continue cording. By adding in only a small amount of fibres when one of the plies starts to get a bit thinner, you maintain a constant diameter of cordage and in effect, the cord is a continuous splice, therefore, there is no real weak spot in the cord.
Below is the cord with 2 splices shown.
A better picture:
Any questions? I will be adding a 3-ply technique, shortly
Doc