 What kind of literary device is being used in the story’s title?
Transshipped seeds invariably failed to germinate, which explained its rarity. In Limbo, moving at multiple light-speeds, the whole Universe, of course, turns into a bright glowing spot in our direction of motion, with everything else dark. With no gravity for reference, how were the plants supposed to know that the 'sun' was supposed to be moving?" And because somehow we had picked up half of the plants in the northern hemisphere of Mypore and the other half in the southern hemisphere, it turned out that half of the plants had a sinistral corkscrew and the other half had a dextral. The way you use it is, you float up on a big ball of water, with the pump piston down—closed.
 Irony: Captain Hannah faces so many trials and tribulations during his time with the plants that his voyage is very much NOT a cakewalk to Gloryanna.
 Metonymy: “Cake Walk” is a literal attribute/adjunct for the part of the ship Captain Hannah grows the marocca in.  Irony: Captain Hannah faces so many trials and tribulations during his time with the plants that his voyage is very much NOT a cakewalk to Gloryanna.  Metaphor: Cake walk is a metaphor the narrator uses to describe Captain Hannah’s journey once complete. They were both surprised at the venture’s absurd ease.  Euphemism: “Cake walk” is used by the narrator to politely suggest that the plants had their way with Captain Hannah.