Packt Like Sardines In A Crushd Tin Box lyrics

there are bomb? doors and there are revolving doors doors on the rudders of big ships and there are revolving doors there are doors that open by themselves there are sliding doors and there are secret doors there are doors that lock and doors that don't there are doors that let you in and out but never open but there are trap doors that you can't come back from

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What do you think is the meaning of Packt Like Sardines In A Crushd Tin Box by Radiohead?