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Imgur user ThePunNun shared this gallery of photos in which his friend transformed the walls of his room into a level from one of the Baby Mario games. The artist hand-mixed 80 cups of paint for the murals, which in and of itself indicates the level of effort that went into this room. There's no mention of how long it took, but you can tell from the detail that went into the pencil layer that it was a work of love.
"This is a tale. The tale of a boy and a room. Well, man and a room. A talented man and a room. An awesome, talented man and a room. [...]
This is my friend, Matt. I met him at work, at a low-paying job. He works his butt off, and he painted this room as a favor/a "thank you" for a friend. It's been a year or two, but seeing as I've just met him, I think this deserves love now. We all do every once in a while. He's a genuine person in a world of nots, and he did a phenomenal job with this art. (First time the bastard actually painted, too.) He also does tattoo art, short films, and a ton of other creative stuff."