A blue monday

Louis spends the week with his father, a musician, who spends all day practicing a challenging piece and pays little attention to his son. Louis is bored and annoys his father, who eventually takes him to the park at the foot of their building. Louis is captivated by everything he sees in the park. His father, exhausted, falls asleep on a bench. When he wakes up, Louis has vanished. Follows a strange and musical game of hide-and-seek in a park overtaken by Louis' imagination.