Libreria Invisible by Pol Quadens

The last 7 years I’ve seen many invisible bookshelves.
This one dates from 2000. Not sure but seems Pol Quadens was one of the first to feature the invisible library.
Ovo editions brought it into the wild.
What I like about this one that it doesn’t have the typical vertical form. Making it horizontal, is also raising the bar technically, as it really isn’t that simple to hang it on the wall. Simplicity in form, but complexity in technique.