On any given day, the sound of footsteps and laughter echoes across the brick of Bison Square — the same place where generations of students have met for dinner, studied between classes, or lingered long after sunset. Decades ago, though, the heart of campus was nothing more than a muddy shortcut worn down by thousands of shoes. The student-built Bison Square — now considered the heart of Lipscomb’s social life — has celebrated its 45th anniversary this year. President Willard Collins smiles for a photo when Bison Square was completed (1981). The area exists thanks to the Lipscomb students of the 1970s and 1980s who helped make the square a…