Prison - One Bar

: Because these bars provide very little room for movement, ensure limbs are not positioned in a way that cuts off circulation. Use padded cuffs if staying in the position for an extended period.

: It is essential to practice safe, sane, and consensual restraint. One Bar Prison

The world doesn't need four walls and a ceiling to keep you trapped. Sometimes, it only takes one bar. : Because these bars provide very little room

But they cannot leave.

Here’s a helpful review of One Bar Prison (assuming you’re referring to the novel by Andrew Diamond—if not, let me know and I’ll adjust): let me know and I’ll adjust):