I don't know why these shapes are used but this just came to my mind for no reason.
When the triangle took the letter from Satoshi Nakamoto, pyramiding came up to my mind. I don't know about the circle or the other guy, that dialogue, taking the letter is like that triangle taking Bitcoin to the users, like pyramiding, a scam. Don't mind me though, this is just a canon based on what I read, it is nice though, keep this thread updated.
What (planet) are you on?
Lols, you get all kinds here don't you? Anyway, dude, art is not something I pretend to understand, but for me, all art for Bitcoin has been enjoyable, I have been quite surprised at the feedback from the public when the past recent ones also shared like you have, makes me wonder if I've really learnt anything about people!
And your web comic is no exception -- I'm enjoying it, as much as is possible to enjoy with only 2 strips out.
Tip: edit the title of this thread. Typos do tend to... drive people away;)