July 17, 2026
Subway grime, but make it data
Estimating the heights of New Yorkers from their scuff marks
One subway wall, one wild height guess, and commenters instantly started roasting the math
TLDR: A blogger used marks on a Brooklyn subway wall to make a playful guess about New Yorkers’ height, but the comments became the real event. Readers split between calling it delightfully clever, questioning whether the marks were even from shoes, and joking about the chaotic final image.
A Brooklyn subway wall covered in shoe-like scuffs has turned into the internet’s latest “wait, is this genius or nonsense?” obsession. The original post looked at a dark band on the concrete at Smith–Ninth Streets, used a nearby keypad as a ruler, and tried to estimate how tall New Yorkers might be based on where their feet hit the wall while waiting for the train. In other words: yes, someone saw dirty marks in the subway and thought, I can do statistics with this.
And honestly, the crowd was very here for the weirdness. One commenter loved the whole vibe, comparing it to a family game of spotting “normal distributions” in everyday life — from door handles to oil stains to those dirt paths people create by ignoring sidewalks. That turned the post into a mini love letter to the idea that humans leave patterns everywhere, and nerds will absolutely measure them.
But the comments also brought the drama. The biggest skeptical hot take? Are those even shoe marks? One reader bluntly asked why everyone was assuming feet, not swinging bags or briefcases — which would neatly explain the post’s hilariously impossible giant-New-Yorker results. Another person wasn’t debating the science at all; they were stuck on the visuals, admitting the final image “caught me off guard,” which feels like the most relatable possible review of a blog post about subway grime. And in peak internet fashion, one frustrated commenter couldn’t even access the page and immediately asked for a mirror at Web Archive, because even niche wall-scuff discourse apparently needs backup copies.
Key Points
- •The article analyzes a dark band of scuff marks on a concrete wall at Smith–Ninth Streets station in Brooklyn.
- •A 32-inch yellow keypad beside a maintenance door is used as a physical reference to convert image pixels into inches.
- •The author computes relative luminance in a selected wall region and averages each row to estimate wall darkness by height above the floor.
- •The resulting distribution is treated as a proxy for where commuters’ shoes most often strike the wall.
- •A simple body-to-scuff-height ratio from a personal experiment produces plausible average heights but unrealistic variance, leading the author to identify leg angle as a missing variable.