Why is the Glass Menagerie called a memory play?

The Glass Menagerie is a memory play, and Tom makes it clear from the beginning that we are seeing events through the lens of his memories, heightening emotions and drawing out significances as memories do. We are also privy, however, to memories within memories – the recollections of Amanda as she speaks of her girlhood, and her futile attempts to relive it. Even Jim is trapped in a cycle of memory, as he yearns to recapture the glory days of his high school career and becomes attached to those who remember him from that time. In the end, however, we are left with the haunting image of Tom's last memories, as he describes the figure of Laura following him through the rest of his guilt-stricken life.