Block Inspection

Red cube plus blue cube! I reached up to the wooden toy shelf and seized two bright plastic counting blocks! One, two! Click! I stacked them with sharp, absolute precision directly atop a yellow cylinder. Perfect vertical alignment! But then—wobble! The cylinder tipped sideways. Tilt! Error! That is not a flat base! Improper geometry violates standard structural rules! I instantly snatched the faulty cylinder away, slapped down a solid green square instead, and pressed the column flat with my open palm. Click! Zero wobble! Now it stands at a rigid ninety-degree angle! Exactly as ordered!