介质

介 = 人 + 丿 + 丨 : Mnemonic symbol: 介 looks like a rocket 🚀. Neanderthal Man (人) and Joan of Arc (ji) are preparing a rocket (介) for its start. Between (介) the layers of the outer shell (介) they are stuffing bananas (丿) and dinosaur bones (丨).

质 = ⺁ + 十 + 贝 : James II of England (zh) captured a crab (贝) and keeps it as a hostage (质) In the space station's bathroom (Ø4). James II of England wants to find out more about the nature (质) of the banana tree (⺁), so all the crab gets to eat is the banana trees. Secretly the crab set up a small cross (十) to which it prays everyday for its release.