縫線

缝 = 纟 + 逢 : Frankenstein's Monster (f) is on a blind date (逢) with the silk worm (纟) in the engine's kitchen ((e)ng2). The date goes very smoothly, the silk worm even sews (缝) Frankenstein new underpants.

缝 = 纟 + 逢 : Frankenstein's Monster (f) is on a blind date (逢) with the silk worm (纟). In engine's bathroom ((e)ng4) he secretly inspects the panties the silk worm made for him and is amazed as he finds out that the panties are without any seams (缝).

线 = 戋 + 纟 : Mnemonic symbol: barbed wire.

线 = 戋 + 纟 : The silk worm wants to use the floating tank in the anthill's bathroom, but there's already Marie Curie inside—and she secured the tank by setting up barbed wire all around it.