An analogy of MS/Apple/Linux users came to my mind. Its like wearing clothes. Windows is a warehouse, noname. Mac is a brand like Stones, D&G, Kevin K

lein. Linux is a radioshack. It is a source code. It is materilal from which you can build your own style. Every linux user is different.
Yet another analogy. Cooking food. Mac is a restaurant, Win is junk food (McDonalds), Linux is cook at home (including 'heat this in microwave oven for 3 min and eat').

The word 'linux' can be substituted by {Open,Free,Net,DragonFly}BSD or any other open source project.