I wanted to create a design with a message that would appeal to everyone and that could be easily understood regardless of language.
The message I wanted to convey was that we are all human no matter which sex we are, what our race is, what sexual orientation we're inclined towards, or who we are as individuals.
To express this I used pictograms to indicate male or female, primary colors to indicate race, and patterns within each form to suggest individual differences. I also placed a male and female together, as well as two females and two males together to indicate sexual orientation.
They all hold hands to suggest unity and mutual respect.
When I was in junior high I read in an anthropology book that all races evolved from three basic races which made me think of primary colors, so I've always thought of us as varying blends and shades and tints within a rainbow of colors.
No matter what differences we have we're all part of the same species and we should appreciate each other and learn to understand where we're all coming from (but even if we don't, everyone has the right to choose who they are and how they live.)
The only thing I had a hard time with was using a dress to symbolize the female because most of the girls/women I know wear jeans or shorts rather than skirts or dresses, but in all my travels the differentiation between male and female is expressed in its most simple pictographic form using legs and dress.
I suspect this is because these symbols originated this way and it caught on around the world, so I'm sticking with it because it's the most readily understood and I wanted this design to speak to as many humans as possible.