Conversation so far:
What was Frank Lloyd Wright's dealings with the Prairie Houses?
Between 1900 and 1901, Frank Lloyd Wright completed four houses which have since been identified as the onset of the Prairie style.
What was special about the Prairie style?
Frank Lloyd Wright's residential designs of this era were known as prairie houses because the designs complemented the land around Chicago.

Question: What about the design was different?
Self-contained rewrite: What about the design was different in the Prairie style?