The Lines Are Still There: Announcing The Spatial Echo
I have finished a book about the city I grew up in. The Spatial Echo: Flint and a Geometry That Outlived Its Authors is complete, at 71,000 words, and this week it went to a university press for review. This post says what the book is, what it found, and why I wrote it.
What the book is
In July 1937, four appraisers working for the Home Owners’ Loan Corporation spent four days in Flint, Michigan, and wrote a grade of A, B, C, or D onto every residential district in the city. The policy that sent them ended decades ago. The plants the city was built around are closed. The state has governed the city twice through appointed managers, and Flint has lost 59% of the people it held in 1960. The book asks one question: are the lines still there?
To answer it, the book reads the 1937 map against Flint as it stands today. Every one of the 54,918 parcels in the city’s 2024 assessment file. Every one of the 7,709 census blocks in Genesee County from the 2020 Census. The city dug out 26,768 lead service lines after the water crisis and filed them, address by address, with a federal court. Each is placed on the 1937 map and read against the grade the appraisers wrote.
What it found
The lines are still there, and the book found where, at what scale, and by what means.
At the parcel scale, the grades still order the city. On the ground, the appraisers graded A; 3.8% of residential parcels are vacant land. On the ground, they graded D; 39.1% are. Value, condition, and the material of the pipes beneath the houses follow the same order. Averaged into census tracts, which is the scale nearly all of the research on redlining uses, the pattern disappears, because tracts mix grades. That is a finding about the field’s method, not only about Flint.
The remedy followed the geometry. The lead pipe replacement program, the largest ever completed in an American city, reached the B-graded ground before the D-graded ground even among houses built in the same decade. The houses it never reached were empty, tax-foreclosed, or in the poorest repair, and those too lay on the lower grades.
The geometry left the map. The county divides outward from the graded city on every measure. Flint and Detroit, both graded, lose students and come under state oversight together, each on its own 1937 ground. The hospitals that served the graded city consolidated and left for Grand Blanc. What travels between places is conditions, people, money, and institutions. Lines do not travel. What stays behind is the surface, the people who cannot move, the gap, and the debt.
The book makes no causal claim. Every comparison follows a rule written down before any result was seen, and each chapter closes by stating what it cannot establish. It describes, and it lets the framework explain.
The framework
The Spatial Echo holds that a policy writes a distinction onto a place and that the writing outlives the policy, because inscription needs a surface and the built environment is that surface. The geometry a line makes organizes how outcomes fall across the space it divides, in property, credit, taxes, work, schools, health, and environment alike, long after the authors are gone. The framework reads through three lenses: critical race theory for what the policy sorted, critical policy analysis for the gap between what the policy said and what it did, and critical geography for the ground itself, which holds that a city’s geography is not an accident but a tool of power. Its sender and receiver model names what travels between places: a sender’s pressures, whether growth, loss, a state’s law, or an institution’s decision, carry conditions, people, money, and institutions into places the policy never mapped, and each receiver takes them onto its own inscription.
The framework grew out of the Michigan school finance studies I published with Phillip Caldwell and Jarvis Richardson in the Journal of Education Human Resources, which found funding followed property wealth, and property wealth followed segregation. The Center’s two research briefs, on eight Michigan metropolitan counties and on the Nashville–Clarksville sender and receiver system, were its first uses. This book is its first full application to one place.
Why Flint
I was a child in Flint when Interstate 475 was cut through the city’s north side, through the two neighborhoods the 1937 map had graded D, and I played in the trench. I did not know then what the trench was. I know now that it ran through St. John Street and Floral Park, that the people who lived there were cleared for it, and that the ground it opened is the ground this book reads. Flint is where I first learned to see lines. The book is my attempt to show them to anyone, using records that anyone can download.
What happens next
When a press accepts it, I will say so here, and the Center will post the figures, the data sources, and the note on sources and data that let any reader rebuild any table in the book. Until then, the two research briefs that carry the framework are on the Center’s briefs page, with their DOIs, and the Journal of Spatial Equity and Education is open for submissions from anyone reading their own city the same way.
Rajah E. Smart, Ed.D. Executive Director, Tennessee Educational Funding and Policy Center
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