Editor’s note: This is a series celebrating America’s 250th anniversary, exploring the amendments to the United States Constitution and how they have shaped the nation.

When you build something, it’s important to understand how it will be used. It has to be structured to accommodate function.

There are no specific numbers that dictate the size of a federal prison cell. Design standards recommend about 75 square feet. Those standards are not law. A cell can be smaller. It can house two people. Overcrowding can force even more into the same space.

In most situations, there are limits to how many people can occupy a room. Building codes establish minimum standards for safety and habitability. Bedrooms cannot be called bedrooms if they are too small, lack a window or fail other requirements. A residence must have multiple exits in case of fire. The knob-and-tube wiring acceptable decades ago would not pass inspection today.

Our standards evolve as society advances.

The Eighth Amendment functions like a building code for the justice system, outlining what is and is not acceptable.

“Excessive bail shall not be required, nor excessive fines imposed, nor cruel and unusual punishments inflicted.”

The amendment recognizes punishment may be necessary. It also establishes boundaries, even if those boundaries are not precisely defined.

The “cruel and unusual” part is what draws attention. It calls to mind old-fashioned consequences like the stocks or public whipping. It is cited in arguments over capital punishment and life sentences.

But the amendment itself is broader than that.

“It includes a kind of implied measure of proportionality,” said Quinn Cozzens of the Abolitionist Law Center.

That’s the idea that a punishment should fit the crime. It dates to the Magna Carta. However, across Europe there were other, darker methods of punishment and inquiry used for generations before the Constitution was drafted. They happened in America with the kind of harsh measures used in the Salem witch trials. Giles Corey, for instance, was pressed to death under increasing weight for failing to enter a plea to witchcraft.

Would that be considered cruel or unusual? The amendment doesn’t give those specifications.

That has left generations of lawyers and lawmakers to argue and interpret. Modern courts have looked to “evolving standards of decency.” In other words, what was acceptable in 1800 was not what was acceptable in 1900 and definitely not 2026. The amendment itself is proof of such evolution.

“Congress may introduce the practice … of torturing, to extort a confession of the crime,” said Patrick Henry. “They will tell you that there is such a necessity of strengthening the arm of government, that they must have a criminal equity, and extort confession by torture, in order to punish with still more relentless severity. We are then lost and undone.”

That evolution can be seen in debates over execution methods, juvenile sentencing and prison conditions.

It also means the amendment extends beyond a judge’s sentence. Constitutional questions do not end when a prison door closes.

The conditions people face once incarcerated can become Eighth Amendment issues. Medical care, use of force by correctional officers and prolonged solitary confinement have all been the subject of constitutional challenges.

“The harms of solitary confinement are well known and long lasting,” Cozzens said.

The United Nations has said more than 15 days in solitary confinement can constitute torture. Yet people in American prisons have sometimes spent months or years isolated from meaningful human contact.

Even when courts disagree on where constitutional lines should be drawn, those debates reflect the continuing importance of the amendment itself.

“The Eighth Amendment is really the only, or the primary, government check on the way that it punishes people,” Cozzens said.

That matters because most incarcerated people will eventually return home. The conditions they experience while imprisoned do not remain behind prison walls. They affect families, neighborhoods and communities after sentences are completed.

“The basic concept underlying the Eighth Amendment is nothing less than the dignity of man,” U.S. Supreme Court Chief Justice Earl Warren wrote in 1958. “While the State has the power to punish, the Amendment stands to assure that this power be exercised within the limits of civilized standards.”

The Eighth Amendment does not guarantee comfort. It does not eliminate accountability. It does not prevent punishment.

Instead, it asks an enduring question: What standards must a civilized society impose on itself when it exercises its greatest power over another person?

Like building codes, the answer continues to evolve. But the principle remains unchanged. Even punishment has minimum standards.

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