A small village sat beside a wide river. Every spring, the river overflowed, leaving behind piles of stones of every shape and color. The villagers collected them for different purposes.

Builders wanted flat stones for walls. Artists wanted colorful ones for mosaics. Children simply wanted the smoothest stones to skip across the water.

For years, everyone kept their own piles. A builder's "foundation stone" might be an artist's "gray oval," while a child's "best skipper" could be the very same rock. Whenever neighbors traded stones, arguments followed.

One day an old cartographer visited the village. Instead of sorting stones himself, he drew a simple chart.

He asked, "What is a stone?"

The villagers answered with uses: "A brick." "A decoration." "A toy."

The cartographer shook his head.

"A stone is a stone. What it is comes before what it does."

So together they listed what every stone could truly have: size, weight, color, shape, and where it had been found. Then they noted that a stone could have many uses, and each use belonged to whoever needed it.

The builders grumbled that the chart was too abstract. The artists said it was missing beauty. The children thought it was boring.

Yet as the seasons passed, something changed.

When a bridge needed repairs, the builders found every flat, heavy stone without searching every yard. When the artists planned a mural, they discovered colors no one realized they already had. When the children wanted skipping stones, they simply asked for smooth, light ones near the riverbank.

The chart had not made the stones better. It had made understanding them easier.

Years later, a young apprentice found the old map and suggested adding a new column called "favorite stone."

The village laughed.

"Favorite to whom?" they asked.

The apprentice paused, then smiled and added a new page instead:

-Person
-Stone
-Reason it is a favorite

The old cartographer, now long gone, would have approved.

Moral: A good model does not describe every opinion about the world. It describes the world clearly enough that many different opinions can live upon it without creating confusion.