Final answer:
The riddle is meant to challenge the assumptions about a one-storey house. As there are no stairs in a one-storey house, the question itself is a trick designed to cause reflection.
Step-by-step explanation:
The riddle presented asks about the color of the stairs in a one-storey house made entirely of redwood.
The answer to this riddle is that there would be no stairs in a one-storey house since stairs are typically needed to move between multiple levels, and a one-storey house has only one level.
Therefore, the question is a trick question aimed to provoke critical thinking.