Cloud bookcase. Smoothing Modifier is required.
https://chaplins.co.uk/shop/cappellini-cloud-bookcase.html 

Polys: 44,386
Verts: 43 994

PRODUCT DESCRIPTION
The cloud design, created in 2004 by the recognized design duo Ronan and Hervan Burullecky for cappellini, is a well-known design thanks to its unique shape and list of possible applications. The cloud was created using rotational molding technology and is designed to work as a whole or in pairs thanks to the attached clips.

MATERIALS AND FINISH
Construction - white linear polyethylene (suitable for external use).
Clips - 2 x clips for fixing modules of white matte epoxy powder

DIMENSIONS
W 187.5 x D 44.5 x H 104 cm.
The hole diameter is 34 cm.

Who works in the V-Ray version lower than 3.1, be careful, in some materials in the BRDF section there is a Microfaset GTR (GGX), if your version is older than 3.1, then
BRDF field will be blank. Choose Blinn, Phong or Ward - which is preferable to you.