There are a lot of invisible walls being built up these days between people, between political parties, between religions and even between countries. These invisible walls come because of two things rolling around our minds and hearts: judgment and criticism. Paul Sample painted a provocative picture called A Picnic in Vermont that illustrates well these two bricks that form the basis for all division.
http://seekinggoddaily.com/truth%20in%20color/thewallsofjudgementandcriticism.html