The following text is from Shyam Selvadurai's 1994 novel Funny Boy. The seven-year-old narrator lives with his family in Sri Lanka. Radha Aunty is the narrator's aunt.

Radha Aunty, who was the youngest in my father's family, had left for America four years ago when I was three, and I could not remember what she looked like. I went into the corridor to look at the family photographs that were hung there. But all the pictures were old ones, taken when Radha Aunty was a baby or young girl. Try as I might, I couldn't get an idea of what she looked like now. My imagination, however, was quick to fill in this void.

@1994 by Shyam Selvadurai.

According to the text, why does the narrator consult some family photographs?