Many antique black powder rifle barrels were made in an octagonal shape.
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Well, honey, an octagonal prism is a shape with eight sides and two identical octagon faces. It's like a fancy pencil sharpener or a stop sign, but less useful and more mathematically intriguing. So, if you ever need to impress someone at a cocktail party with your geometry knowledge, just drop the term "octagonal prism" and watch them swoon.
There are few "real life" examples. Tin boxes, for Quality Street, for example, or eight-sided glasses are two.
Function is a practical purpose an item serves in life. An item for aesthetics only is just for looks.
A solid brick is a rectangular prism. (this one example of many)
Looks at Life was created in 1967.
A pencil.
A tent
A gaming die.
A real life example is a Toblerone chocolate bar which is in the shape of a triangular prism.
a doghouse
a peice of cake