This paragraph is pretty hard to parse by a newbie. I'm embarrassed to say how long it took me to understand these simple concepts: 😅 - It might not be obvious on first read that an "option transform" is a thing (it might work better in bold) that refers to something like `Plot.groupX(output, options)`. - It's also not obvious that a mark's options object is the second argument of the option transform: ``` Plot.barY( penguins, {x: "species"} // This object… ).plot(); Plot.barY( penguins, Plot.groupX( { y: "count" }, { x: "species" } // …is the same as this object. ) ) ``` - Finally, I think labelling the anatomy of this command would help newbies get their bearings: ``` Plot.barY( // the barY mark penguins, // the data we're working with Plot.groupX( // the option transform { y: "count" }, // the outputs object (tells Plot to create a new "y" channel with the counts) { x: "species" } // the options object (tells the barY mark to bind the "species" data column to the "x" channel) ) ) ```