Identify the type of figurative language used in the sentence:
"My life is an open book"
The type of figurative language used in the sentence "My life is an open book" is a metaphor.
Complete the following task based on the instruction and optional input provided.### Instruction:
Identify the type of figurative language used in the sentence:
"My life is an open book"

### Output:
The type of figurative language used in the sentence "My life is an open book" is a metaphor.