For some time there has been a race going on between Educa and Ravensburger for the worlds biggest puzzle. Some years ago Ravensburger hired a new designer and I somehow can't stand their style any-more. But Educa is still going strong. Sadly I'm now out of wall space...

Another topic would be how to safely attach a puzzle onto a ceiling... This would add more options.. Putting it on the floor could also work, but adds entirely new requirements for protection... Maybe that path would end up in building a glass floor...