According to Chapter 41, what is the story behind the Sai Baba portrait that was delivered on Holi? Who was involved and what happened?

The story of the portrait is told from the perspective of Alli Mohammed. As recounted in Chapter 41, one day while wandering in Mumbai, Alli came across a merchant selling various pictures of saints and holy men. He was immediately drawn to one particular portrait of Sai Baba, finding its attractiveness greater than all others. Since Sai was already his worshipped deity, he felt an urge to have it, paid the price, and took it home. He hung it on his wall and took its Darshan daily with great love. This is the very portrait that he later brought to the narrator's house on the day of Holi, creating a wonderful and humorous divine play, or Leela.