What it is
Where the method is a sticky dinner plate, the cage is a cloud and a carpet. You pack groundbait, hookbait samples and maybe a bit of chopped worm into an open-end or cage feeder, cast to a clip, and let it empty. Fish graze the resulting patch.
It is the default on many natural stillwaters, reservoirs and slower rivers. Hooklengths are longer than a method — often 50–80cm — so the bait sits just off the pile. Recasting is how you feed; sitting motionless on an empty cage is how you blank.