Read the excerpt from "Keynote Address." These [monetary investments in education] are the foundations from which towers of human achievement can soar. Which rhetorical device does Inouye use in this excerpt?

Inouye compares monetary investments in education to foundations and human achievement to towers that can soar. This is a metaphor: it describes one thing in terms of another without using “like” or “as.” The phrase does not point to a specific outside reference, so it is not an allusion.

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