system
A chat on subreddit /r/me_irl
human
Nobody ever really heard of this kindergarten artwork before the security guard drew the eyes on it and now it’s famous worldwide, so explain why it isn’t triple the original value now with its newfound fame and exclusivity being one of a kind as I’m sure the original art piece was replicated by the artist several times if it was so valuable.
gpt
Value is determined by rarity, number of original works and copies, and demand, how much people are willing to pay, amongst other factors.

Edit for value to triple would require specific people who are willing to spend that amount on graffitied art.