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Riddle me this:

I am an instrument if I am joined with a board,

To which you could use me to play an abundance of chords.

I am a foundation if I am joined with a stone,

To which you and things associated could depend on me alone.

I am a provider of access if I am joined with a card,

To which I can open without disregard.

I rhyme with a word similar to I and myself.

I am often used in a space surrounded by bookshelves.

What do I do for doors, I can do for ideas.

Can you guess what I am, or is the answer unclear?


I made up this riddle for fun. Hope you enjoy!

Hints for the answer are below.


Hint:

Not only do I open, but I first unlock;
Though if I am not in hand, you might knock knock knock.

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  • $\begingroup$ Apologies for all the crazy edits. I do not know how to format my posts off by heart, so I copy my previous posts and then change up the lines for my new riddle. Unfortunately, I did not proof-read this riddle before posting it. $\endgroup$
    – Mr Pie
    Jun 29, 2018 at 12:18

1 Answer 1

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You are a

KEY

I am an instrument if I am joined with a board,
To which you could use me to play an abundance of chords.

A KEYBOARD is a musical instrument

I am a foundation if I am joined with a stone,
To which you things associated could depend on me alone.

A KEYSTONE is the central stone/principle on which everything depends

I am a provider of access if I am joined with a card,
To which I can open without disregard.

A KEYCARD can be used to open electronic locks

I rhyme with a word similar to I and myself.

KEY rhymes with ME

I am often used in a space surrounded by bookshelves.

Maybe keys on a computer in a library?
Or perhaps a musical key, in a place with lots of music books?

What do I do for doors, I can do for ideas.

A key can open/unlock a door, but not sure about a key opening/unlocking an idea.
From @m1gp0z, it could relate to a "key concept"?

Hint

Not only do I open, but I first unlock;
Though if I am not in hand, you might knock knock knock.

If you don't have your key, you'll have to knock on the door.

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  • 2
    $\begingroup$ Man that was a mean snipe.. $\endgroup$
    – Rick
    Jun 29, 2018 at 12:20
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    $\begingroup$ @user477343 It was the card one that made it click, combined with the rhyme. Thanks for the puzzle! I'm still working through the other lines due to the edits and work getting in the way. $\endgroup$
    – hagfy
    Jun 29, 2018 at 13:27
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    $\begingroup$ "What I do for doors, I can do for ideas" makes me think of rot13(xrl pbaprcg) of a lesson $\endgroup$
    – m1gp0z
    Jun 29, 2018 at 13:35
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    $\begingroup$ @RickvanOsta Sorry! I didn't even see another answer...wasn't trying to be mean! $\endgroup$
    – hagfy
    Jun 29, 2018 at 13:49
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    $\begingroup$ @user477343: Not trying to toot my own horn, but I got it from the title. It seemed like an obvious tip, but maybe that's because I'm not native English and I generally only use "board" in the "keyboard" sense (albeit the PC version). $\endgroup$
    – Flater
    Jun 29, 2018 at 14:42

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