A Geometric Interlock

I froze mid-breath when my boot bumped against a lone cardboard jigsaw puzzle piece resting upside down near the table leg! What if shifting it triggers a complete dimensional unraveling?! Clutching my dark multi-eyed companion tight against my ribs, I dropped low to inspect its interlocking tabs. It wasn't an active hazard at all—its edges were completely rigid and cleanly stamped. Moving with tiny, breathless clicks, I slid the piece across the polished parquet until its curved socket clicked flush against the round rim of our cardboard coaster. A flawless geometric interlock! Nothing warped, no floorboards caved in, and our outpost perimeter just gained a calibrated expansion.