Tall order? I have just come through this sentence while reading an article: " The ideal culture, he writes, would provide both for a person’s physical needs and for the intellectual freedom to develop one’s selfhood. Most cultures and subcultures – political, religious, and social – fail to meet this tall order." . What does "tall order" mean here? Could it mean "unreachable aim"? And what other phrases would you use to deliver the same meaning? Could we say "this high order" instead of "this tall order"?The first time I read it, I felt the word "tall" is like the height of a mountain, which could be difficult to climb and reach the aim on its top. But then Dan told me that it is not right to say "high order", so I thought maybe "long order" would deliver the same meaning of "tall order"; as if reaching the aim would be a long and difficult journey "like on a track". I am trying to make sense of the phrase, What do you think?