What was the significance of the Supreme Court case Reynolds v. Sims in terms of electoral representation and the principle of "one person, one vote"?

In the Supreme Court case Reynolds v. Sims, the court ruled that state legislative districts must be roughly equal in population size to ensure fair representation, following the principle of "one person, one vote." This decision was significant as it helped to address disparities in electoral representation and promote the idea that each person's vote should carry equal weight in the democratic process.