Page 119 - Peter Randall "The Craft of the Knot.."

The Clove Hitch Knot is also the basis for other knots, and the last
tuck can be slipped if a quick release is desired.

ICICLE HITCH

John Smith of Surrey, England, first demonstrated the Icicle Hitch by
using it to suspend his weight from a tapered wooden fid that was
hanging point-down from the ceiling. Like finger cuffs, this hitch will
shrink to grab strongly, then loosen easily when the strain is taken off.

STEP 1 Start with a good length of running end and make a crossing
shown here.

STEP 2 Cross the running end to the left and behind the pole.

STEP 3 Bring the running end around the pole, tucking it under the
crossing. Complete four turns, tucking the end each time.