Cloud cuckoo land
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Cloud Cuckoo Land refers to an (unrealistically) idealistic state where everything is perfect - "You're living in Cloud-cuckoo-land". It hints that the the person referred to in quotation is naive, unaware of reality or deranged in holding such an optimistic belief. The reference is to the play by the Athenian playwright Aristophanes, The Birds, in which the birds of the title, tired of the Earth and Olympus, decide to erect a perfect city between the clouds, to be named Cloud-Cuckoo-Land (Nephelokykkygia).