Field guide No. 253
The starry egg in the carton
One of these is not breakfast.
A carton of twelve white eggs holds one that is deep blue and full of stars. Best before: the heat death of the universe.
Field noteTaken as a painted egg, it passes. Taken as a carton holding the sky, it would be a different file.
Also possible, also breaking category
Shell accommodationHermit crabs moved into shells long before anyone with a staircase did. Scale is the only holdup.
Downhill unspoolingThread is white and laid in lanes; so are pistes. The groomers have merely taken the hint.
The orange committeeSplit oranges can be arranged round a teapot by anyone with a knife. The quorum is implied.
Clamshell cornflakes at breakfastClams in milk instead of flakes: wrong breakfast, perfectly possible clams.