This is a quote from an activist named Nelson Mandala. He was someone during this time period who really impacted the Civil Rights era. He changed peoples lives in Little Rock Arkansas for the better. For example, African Americans lives like Liz were improved because earlier in time it was difficult for her and her family members to deal with society but now African Americans are treated more equally.
The simple use of pencils to show difference is a really smart idea which not only explains the poster immediately, but really grabs your attention. The background is nice and bright and gives the poster a happy feel, and the font is almost like a child's handwriting which goes well with the pencil idea.
This quote illustrates that everybody is happy the way they are, and there is peace everywhere when in fact there isn't. Accepting that one's race should be continuously oppressed is unjust because by denying there is no racism, actions or behaviour happening around you is considered normal.