The Wheel on the School by Meindert DeJong
This is truly an odd story. A village in Holland is sad because no storks come to nest in their town. The children and their teacher decide to change things by making a project of it; they will find an old wagon wheel and put it on top of the school for storks to nest in.
Pretty soon, the whole town is involved in the project. Everyone is out looking for wagon wheels. Everyone is figuring out how to put the wheel on the school. Everyone is helping put the wagon wheel on the roof of the school. There are plenty of difficulties in the task, including finding the wagon wheel in the first place. The project creates unexpected side benefits of a strong community spirit and new friendships.