Fact 1: Folding an object causes that object to change shape.

Fact 2: By default all objects are assumed to be solid.

Given the two facts above, answer the question "what can you fold to cause it to change shape?" with the following options: 
- gas
 - a prism
 - liquid
 - biceps
 - solid
 - Enzymes
 - particles
 - fibers


 

     solid    