 If you liked
Suzumiya Haruhi no Yuuutsu (2009)
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 ...then you might like
Mawaru Penguindrum
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Both of these anime require an effort from the viewer to understand their deeper meanings. If you enjoy analyzing things beyond what appears on their surface, you will enjoy both of these. Both appear shallow on the surface, but you must watch carefully and pay attention to small details to get what the creators really want you to see.