"It really seems like that," Catherine cautiously touched the wall. Although smooth, the wooden wall felt uneven, similar to natural tree growth. However, the girls could hardly fathom how the interior of a tree could transform into a house or even sprout features like stairs. So Catherine couldn't help asking, "Did you design the room layout before the tree grew, and then have them grow according to your design? Wouldn't that mean you'd have to wait decades or even centuries to have a house?"