I put dihydrogen monoxide (H2O) into plastic containers (of grape juice concentrate) in order to form entry gate columns. I was aware that H2O expands by approximately 9 % when it freezes because as liquid H2O cools below 277 K (4 C), its molecules begin to form a more open, hexagonal crystal structure with more space between them. Accordingly, I left space below plastic container's cover. However, H2O's expansion was directed downwards towards plastic container's bottom for some reason, resulting in unstable situation.
Stability of plastic containers has been re-established after flipping, and reaffirmed by snowfall.
Both original configuration and flipped configuration suffered from accumulation of dihydrogen monoxide (H2O) at the top. Therefore, plastic containers with convex top are now left in permanently-deformed configuration all year long, symbolising as finials.
