Pinpoint #694

The Solution is: Types of Rock Building Materials

Today’s puzzle looked almost too easy. The first clue was Marble, and I immediately felt that familiar tug: Don’t fall for the obvious. In Pinpoint, the most straightforward answer is sometimes a trap. So instead of going simple, I went broad. When I saw Marble, three ideas popped into my head: Building materials Types of stone Decorative materials Based on past experience, I told myself, They wouldn’t make it that obvious. So I guessed “building materials.” And honestly? That stung a little. It felt logical. Now things tightened up. Marble and Obsidian aren’t just “materials.” They’re specific geological substances. Yes, marble is used in construction. But obsidian? That’s volcanic glass. Much more geological than architectural. I stopped thinking about use cases and started thinking about what they are. That’s when it clicked. They’re both stones. More specifically, recognized types of stone. No tricks. No wordplay. Just classification. I guessed “types of stone.” And just like that, I was done in two guesses. Even though I didn’t need them, seeing Slate, Granite, and Sandstone would have completely confirmed the pattern. All classic natural stones widely used in architecture and construction. Simple. Clean. Geological. Types of Rock Building Materials 1. Don’t outsmart yourself too early. Sometimes the simplest shared trait really is the answer. 2. Shift from “use” to “identity.” If items are used in similar ways, ask: what are they at their core? 3. Second clues are powerful. One word can collapse a broad theory and force a more precise category. 4. Broad categories are risky. “Building materials” was technically related—but too general.