What could be considered an example of something "amorphous"?

The term "amorphous" refers to a lack of a definite shape or form. The choice of fluffy clouds in the sky exemplifies this concept well. Clouds are constantly changing, floating, and taking on different shapes due to the movement of air and variations in moisture. Their appearance is nebulous and not confined to any rigid structure, which makes them a perfect example of something amorphous.

In contrast, the other choices represent forms that possess a clear, defined shape. A solid block of ice is rigid and has well-defined edges; a well-defined sculpture is created with specific contours and details; and a painted wall has a flat, definite surface. None of these items exhibit the fluidity and lack of fixed shape characteristic of amorphous objects. Thus, fluffy clouds stand out as the most fitting example of amorphousness.