Square lashing

Square lashings are used to bind together two spars that are at right angles with one another.

i) Place the poles on the ground in the shape of a cross. Tie a clove hitch around the bottom pole near the crosspiece. Twist the free end of the rope around its standing part and tuck it out of the way.
ii) Make three or four wraps around the spars, keeping the rope very tight. As you form the wraps, lay the rope on the outside of each previous turn around the crosspiece, and on the inside of each previous turn around the bottom pole.
iii) Then wind three or four frapping turns around the wrapping to tighten the lashing as much as you can.  
iv) Finish it off with another clove hitch.