紅綠燈

红 = 工 + 纟 : Mnemonic symbol: a little red book.

Helga Horse (hu) is reading the little red book (红) in the engine's kitchen ((e)ng2), when she discovers that it is being eaten by a silk worm (纟). She overreacts a little and wants to beat the silk worm with a steel beam (工).

绿 = 录 + 纟 : Loki (lü) wants to preserve the green (绿) chlorophyll of leaves he collected in the space station's bathroom (Ø4) by putting them into his diary (录). As he opens his diary a few days later he is very upset to see that the silk worm (纟) ate all of them by eating through the pages of his diary.

灯 = 丁 + 火 : Don Quixote (d) was going for a walk in front of the engine ((e)ng1) with his lantern (灯) when it suddenly catched fire (火). He used a lantern which utilizes hydrogen, and when he accidentally ripped his lantern open at a nail (丁) on the floor, the hydrogen caught fire.