Analyzing Word Choice: Kaleidoscope in Character Portrayal

Read the following excerpt from a literary essay:

"In her novel, the author meticulously crafts her characters, each one layered with nuances that reveal their complexities. This delicate portrayal reminds readers that humanity cannot be distanced into mere categories. Instead, every figure in the narrative embodies a kaleidoscope of traits, inviting us to ponder the intricate mosaics of their inner lives."

What is the effect of the author’s choice of the word kaleidoscope in this context?