Anna Sui’s mood board is a sight to behold. It takes over a wall in her office, rich with colorful drawings, lush fabric swatches, pages torn from books. It’s a cherished peek into her creative process, evoking the emotion, wonder and joy that her spring collection does. It’s hard to not smile as she excitedly walks one through how the board comes to life in her work. For spring, it’s a life aquatic: Sui spoke about a…