The Four Pebble Formation

The gravel path was far too disorganized, so I marched straight over to the wooden garden border to find proper building material! Smooth grey pebbles scattered under the bushes caught my eye. Naturally, a pyramid was required. I rolled one hefty oval stone to form the base, shoved two slightly smaller rocks directly against it, and hoisted one sharp triangular pebble right on top to lock it all down. Four stones, zero wobbling! As soon as I stepped back to admire my engineering triumph, an enormous snail crept slowly into view, heading right for my tower. Excellent! An official contestant arrives!