Look up the tree!

[Sitifan]

If you look up the tree you can see the little blobs of buds all the way around it.
What does "look up the tree" mean here?
Thanks a lot for your reply.
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Thank you very much for your reply.

[Jamie (K)]

It means if you look upwards at the higher part of the tree.

[Daemon99]

That reminds me of a funny quote I read some where. Hope it isn't inappropriate for this forum.

When on the ladder of success, don't let the boys look up your dress
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Non-native speaker of English
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I intend to live forever - so far, so good.

[Sitifan]

Is "up" a preposition or an adverb here?
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Thank you very much for your reply.

[Jamie (K)]

It's a preposition.