Не буду скрывать, был шок (я увидела небо в клеточку)

I can' t hide that, it was a shock - I saw the sky through the prison bars.

(it's three hots and a cot...)

( the skybox?)

I can't hide I was in shock when I saw sky grid from the cell.

and the window is in a wall (as I suspect), I would consider saying 'through the bars of the (prison) cell window' or even (if the bars were vertical and horizontal and you want to mention this) 'through the criss-cross bars of the (prison) cell window'.

This is because there are lots of different types of 'bars' in a prison -- in cell doors, in corridors, between landings etc -- and not just in cell windows, so 'prison bars' isn't very precise.

It depends on what sort of a клеточка it was and where exactly it was -- which you haven't told us.

Asker: Was it a pleasant shock or a bad shock for the author? Was it the first time she'd been in a prison cell? Or had she been moved from a cell without a window/skylight, to a cell with one? Please explain.

Спасибо всем за ответы!

Frina: I've never heard of 'three hots and a cot' or 'skybox' before, although I've now seen them online. They could be US terms. I can't think of an En idiom which includes the word 'sky' but you could try:

'I (was/found myself) ....

* .... behind bars' (standard English, idiomatic)

* .... under lock and key' (standard English, idiomatic)

* .... banged up' (slang -- from the sound of a cell door banging shut)

* .... in the slammer' (slang -- from the sound of a cell door slamming shut)

* .... in the cooler' (slang)

* .... in the can' (slang) (where 'can'=slang for prison)

* .... doing bird' (criminal slang, mainly UK)

All of these (apart from the last one) are common US and UK terms. However, I don't know whether any of them will suit the register/context of your original.

Навеяло:

I'm goin' back to New Orleans

To wear that ball and chain...