Each panopticon had five floors with 93 cells. ... However, these circular prisons with their 400 or so cells fail as panopticons because the inwards-facing cell windows were so small that guards could not see the entire cell.

Why the panopticon is bad?

The archaic Panopticon design creates a physical environment that is damaging to the physical and mental health of prisoners and operationally dangerous for correctional staff. The grim conditions inside the roundhouse include persistent, insufferable noise-levels; extreme temperatures and poor ventilation…”

What is the panopticon effect?

The panopticon is a disciplinary concept brought to life in the form of a central observation tower placed within a circle of prison cells. From the tower, a guard can see every cell and inmate but the inmates can't see into the tower. Prisoners will never know whether or not they are being watched.