Bob Marley - Concrete Jungle Lyrics Meaning

I will start by saying although a Bob Marley fan, and even more a huge reggae fan in general dub/roots/etc, I have not researched this information. So just like everyone else who did not speak to Bob Marley personally, I could be wrong.

This song is about prison, period. Prison is a jungle in itself. A jungle made of concrete. Many times there is literally no sun, no moon, no light. The chains are, at that point off, but one is still not free, captive. No soft touch and no caress; a tragic reality but still most do their best in spirit and find a way to laugh (as clowns) which is is a direct and bold way to refer to it. Concrete jungle.