* Shell structures are thin, curved structures designed to distribute forces over a large surface area. They are often used in buildings and bridges, and their strength comes from their shape, not their thickness. Examples include domes, arches, and vaults.
* Fish bowls are spherical containers made from glass. While they are curved, their strength comes from the material itself, not from the shape. The glass is thick enough to withstand the pressure of the water inside.
Think of it this way:
* A shell structure is like a strong, lightweight egg shell that can hold a lot of weight.
* A fish bowl is more like a solid, heavy glass sphere that can hold water.
While the fish bowl's shape does contribute to its structural integrity, it's not the primary factor determining its strength. It's the thickness and properties of the glass that do the heavy lifting.