Haiku question

[Magpie]

Typically they're supposed to be about nature or not have human clues?  Like you can say bird but not president.  I feel like cutlery is a human thing so I couldn't say like a spoon.  But then some birds have spoon bills.  So is spoon a human invention ?  Avoid it...   Does this make sense?

I suppose it all depends upon the context. There are also poems similar to haiku called senryu which have the same structure and syllable count but they are more about human imperfections and flaws, they can be cynical and humorous. Haiku are about nature but I would say that they don't have to exclude all human references the example by Issa from Lizzie shows this as is this one by the same author

how lovely
through the torn paper window
the Milky Way

I found lots of other examples by the Japanese masters that use references like this, so it would seem that as long as the ultimate intention is a comment on nature then it is still a haiku.

another one by Chiyo-Ni

the summer moon
is touched by the line
of the fishing rod

I'm sure Tiger and Sir Ambrose will know, but I'll offer you this: my favorite Haiku is translated from Japanese as 

Don't worry spiders:
I keep house
casually. 

I'll have to go look up the author, but it doesn't seem like human stuff is always off limits.

"Sir Ambrose"   at last, respect.