"A hallucination is a species of reality, as capable of teaching you as a videotape about Kilimanjaro or anything else that falls through your life."

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Actually, I do happen to resemble a hallucination. Kindly note my silhouette in the moonlight." The cat climbed into the shaft of moonlight and wanted to keep talking but was asked to be quiet. "Very well, I shall be silent," he replied, "I shall be a silent hallucination.

— Mikhail Bulgakov