Interestingly, back when I was first playing around with Arc, I also thought the logo was odd. I designed a new one based around combining the letter A with the concept of an arch (http://www.paulgraham.com/arcfaq.html).
You can see my logo, with a favicon-sized image, here: http://imgur.com/a/RMGu4#sSFHTHt It uses the same colors as the existing one, and has the black border around the outside.
On the off chance anyone developing Arc sees it and wants to use it, that would be awesome, as long as it's properly licensed -- I'm not sure what the proper free license is for things that aren't code. Creative Commons withe the attribution and share-alike clauses? http://creativecommons.org/licenses/by-sa/4.0/
Also, you look like you're new to the Arc Forum. Welcome! I've been trying to notice when I see someone new, so we can grow the community. What brings you to Arc? What are your impressions so far?
Thank you for the reply and a warm welcome)
I thought it was a chair because of the images on wikipedia page and here http://www.paulgraham.com/arc.html
I got interested in Arc after reading "Hackers & Painters", can't tell anything about my impressions because I don't know much about the language yet, I've discovered it only recently.
I'll definitely learn more about it and then I will have something to say)
Yeah I've seen that image too. It's older, and predates the public release of Arc by a few years. The current logo here came even later. Probably just an abortive attempt.