空
=
工
+
穴
:
In front of the engine, Karl Koala found some very special cave paintings. Using steel beams he constructs a protective cover. He also installs air conditioning to make the best environment possible to preserve the cave paintings.
工
=
二
+
丨
:
Mnemonic symbol: a steel beam, since 工 looks like the cross section of a steel beam. In front of the engine ((e)ng1), Gitta Giraffe (gu) is doing some hard work: She's stacking a capacitor (二) on a dinosaur bone (丨) on a capacitor (二). She's not very successful, but then she gets the idea to use steel beams (工) as support.
cave / cavity / hole / acupuncture point / Taiwan pr. [xue4]
穴
=
八
+
宀
:
Xu Xian presents his newest piece of art: Cave paintings painted on a gigantic eight-ball. Somehow he managed to set it up inside the elevators entrance. For his great artistic achievement, he gained a honorary doctor, and proudly wears his hard earned graduation cap.
cavity of body / barrel (e.g. engine cylinder) / compartment / tune / accent of speech
腔
=
月
+
空
:
In front of the anglepod (ang1) the Queen of Hearts (qi) helps the moon (月) to install air conditioning (空) so that his cavity (腔) is always at the right temperature.
to control / to accuse / to charge / to sue / to invert a container to empty it / (suffix) (slang) buff / enthusiast / devotee / -phile or -philia
控
=
扌
+
空
:
Karl Koala (ku) cannot find the air conditioner's (空) remote control (控) in the engine's bathroom ((e)ng4; he's sitting on it). He doesn't want to get up from the sofa either, so he switches the aircon on using a long toy claw (扌).