Pennyboy always thought houses were just... houses. Simple buildings. 

Houses had walls.
Doors.
Roofs that kept rain out.
Corners that didn’t echo.
Bedrooms that stayed exactly where you left them.

So on the day he discovered a house that moved, Pennyboy decided the Wychwood had gone too far.

The Door in the Middle of the Path

He and Parlock were following a deer trail when Pennyboy walked face-first into something wooden.

“Ow—!” He rubbed his nose. “Who puts a door in the middle of—”