There’s more info on this here: https://www.dezeen.com/2017/11/04/mvrdv-tianjin-binhai-public-library-giant-eye-china-winy-maas/
Particularly:
"Fast-tracking the process caused a few design headaches. The upper shelves directly above the atrium are currently unreachable, after planned access rooms were dropped – a decision MVRDV said was taken by the local team against their advice. As a result, these shelves are covered in perforated aluminium plates that printed to look like books. They are cleaned using a system of moveable scaffolding and ropes.
The firm said they hoped that their “full vision for the library may be realised in the future”.
"
