Final answer:
The artwork 'Guitar and Bottle' reflects the post-World War I era through its use of blurred boundaries, rejection of realistic perspective, and portrayal of dismay.
Step-by-step explanation:
The artwork 'Guitar and Bottle' by Spanish painter Juan Gris reflects the post-World War I era in which it was created in several ways. One way is through its use of blurred boundaries and muted colors, which reflects the era's preference for conservatism. Another way is through its rejection of realistic perspective, which mirrors the rapidly changing and confusing times. Lastly, the painting does not attempt to capture the era's optimism for the future, but rather portrays a sense of dismay and disillusionment.
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