luring fish with a bonfire
罧 centers on attracting fish using firelight, specifically a bonfire, to lure them for capture.
罧 combines 罒 (net) with 林 (forest), suggesting a net set in a forested area, possibly near water, to catch fish lured by firelight. The exact historical development is uncertain.
The top 罒 is a net, and the bottom 林 is a forest. Imagine setting a net in a forest stream at night, with a bonfire on the bank to lure fish into the net.
For リン, picture a ring of fire around the bonfire that lures the fish: ring -> リン, and the fish are drawn to the light.