Why we sketch segments before writing queries

Queries are expensive to argue about when nobody agrees on containment. We borrow geometry language — overlaps, subsets, forbidden zones — because it travels across departments faster than a join diagram.

During Segment Geometry Sprint sessions, we forbid laptops for the first hour. Participants draw shapes on a shared board while a facilitator translates each shape into a sentence: "This circle must always sit inside that one." Those sentences become the contract analysts can implement.

Sketching also exposes "ghost segments," audiences that exist in slides but not in data. Calling them out early saves weeks of rework. Teams often discover that a prized segment is actually a filter typo propagated across three campaigns.

We end by photographing the board and attaching edge-case lists. The photograph is not decoration; it is evidence for future you when someone asks why a certain exclusion exists. If the picture looks silly, that is fine — clarity beats polish.