Concept cars have been a feature of international motor shows for many years. They come in several types. At one end of the spectrum there are the ‘production-ready’ cars which will probably be on sale in only mildly altered form within the next year.

At the other are the ‘never going to happen’ machines which give the designers something to do and the public something to talk about.

In between you’ll find cars which will not go into production but give an idea of what is usually referred to as the manufacturer’s ‘future design direction’.

Here we present a selection of concept cars through the ages. Whichever one you think is the oddest, you can be sure that someone somewhere has produced something even odder.

Alfa Romeo Start