However, on the walls of one of the buildings an alien grins and profound graffiti covers the wall in a splash of color.

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Just like we don't put up armed guards to protect every city wall from graffiti, we should not overreact in cyberspace.

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Because pieces of wall with graffiti are like chunks of gold.

CNN: How I brought down the Berlin Wall

And make sure the wall has a colorful piece of graffiti.

CNN: How I brought down the Berlin Wall

Now, would you let a graffiti artist come and paint a faith message on your wall?

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Spanning 1.3 km, this is the longest stretch of the Berlin Wall still standing and it is covered in graffiti and murals painted in the euphoric aftermath of Berlin's unification.

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Many of the surrounding walls, which are brightly decorated with graffiti art, are the product of locally-organised painting sessions known as the Wall Project, which get people together with spray cans and paintbrushes to beautify their surroundings.

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The owner of this particular wall, which is also a favored spot for other L.A. street artists, whitewashes the graffiti away every so often...

CNN: Message on a wall