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Our article "Butt shape by ethnicity" sets a 2023 MRI study of gluteal anatomy next to the site's own regional profiles and links fifteen group pages. The study combined magnetic resonance imaging, direct measurement and photography, and found the same amount of subcutaneous fat in both of its groups. The difference sat in frame and muscle: the waist, the iliac crest, the hips and the gluteus maximus.
The article reads that finding against what the catalog records. People pages carry a butt profile set over a pelvic profile, frame first, then what sits on it. The piece shows where the study and the catalog agree, where they part ways, and why a photograph cannot separate bone, muscle and fat.
Article heroes are rendered as full-length figures in a tall frame and then cropped to the banner. Illustrations for trait articles are rendered as photographs of real objects.
Under the hood
- The regional profiles cover 23 world regions, each a butt profile (size, set and projection) over a pelvic profile (iliac crest width and how the hips carry fat). The article quotes seven regions in a table and links fifteen group pages, each checked against the profile quoted for it.
- The atlas's butt taxonomy defines seven photo-assessable dimensions, including shape on the Mendieta four-class system, projection in lateral view and lateral hip concavity. The article uses the MRI result to show what a photographic scale records and what lies beneath the silhouette.
- Hero framing: the image model is asked for a full-length figure in a 9:16 frame so the subject lands mid-image, then a 16:9 band is cut at a chosen vertical center and sized to 1600 by 900. The full image is kept, so the band can be re-cut without a new render, and candidates can be previewed before one is promoted.
- Illustration rule: trait-article art is composed as photographs of real objects rather than as charts or diagrams, because the image model invents lettering on anything it reads as a chart, while a photograph of real objects comes back clean. The skin-tone article, for example, opens on a still life of mineral pigment powders.
- group pages linked
- 15
- regions compared
- 7
- world regions profiled
- 23
See it on the site
Sources and open data
- Magnetic resonance imaging Wikipedia
- Magnetic resonance imaging Britannica
- Subcutaneous tissue Wikipedia
- Iliac crest Wikipedia
- Gluteus maximus Wikipedia
- Gluteus maximus Britannica
- Danilla et al. (2023), What Makes a Beautiful Buttock Beautiful? A Case-Control Study Comparing Buttocks Models versus Normal Women by Magnetic Resonance Imaging, Photography and Anthropometry Aesthetic Plastic Surgery
- Mendieta (2006), Classification System for Gluteal Evaluation Clinics in Plastic Surgery
Related build notes
- Sep 8, 2026The fourth dimension: comparing the models that draw the peopleFive text-to-image generators, ten peoples, 200 renders scored against real-photo baselines, and a blind vote with the model names hidden.
- Aug 31, 2026Measuring the ruler: 73 of 84 dimensions pass a test-retest studyA test-retest study over 196 portraits scored the head and neck dimensions, wrote the results into the vocabulary files, and made them citable.
- Aug 31, 2026A corpus of 28,756 facial and body observations over 39 peoples2,681 portraits read by a vision model against 22 controlled vocabularies now yield 28,756 structured observations that feed the trait pages.