The title "Life on the color line" refers to living life through racial divide. This would mean the outcome or impact of one person life based on their skin tone. The title "Life on the color line" would also represent the shaping and challenges one would face or become based on the color of their skin.

The title suggests the idea of being in a constant state of limbo or in-betweenness, constantly straddling the line between two different worlds or identities. It conveys the struggle of trying to navigate and survive in a society that is often divided and discriminatory based on race. It hints at the complexities and nuances of racial identity and the experiences of those who do not neatly fit into one racial category. Overall, "Life on the color line" encapsulates the challenges, injustices, and resilience of living in a world where race plays a defining role in one's life.