Spoons are one of the simplest tools. Basically a bowl on a stick. The bowl transfers the food and the stick keeps your hand from having to touch the food. Simple.
However, spoons have evolved into surprisingly complex tools. They are still simply bowls on a stick, but the shapes and contours all need to work together to do four things: transfer food efficiently, be comfortable in the hand and in the mouth, maintain a certain degree of lightness, balance and strength and to be aesthetically pleasing. In order to fulfill those goals, spoon carvers will add things like a keel to maintain rigidity and strength to a thin, light handle. Different regions have solved these goals in various ways. A Welsh cawl spoon is significantly different than one from Romania, which in turn differs from spoons from Russia or the Scandinavian countries. Different bowl shapes, handle lengths and other features work together to meet the eating habits and cuisine of each country. I have included a brief diagram of a modern Swedish style spoon. If you were to look at a spoon from Sweden from 100 years ago, the bowl would be bigger and have a flat rim, most likely. This style spoon has adapted to meet modern eating habits.