WHEN DID WALLPAPER BEGIN TO BE USED ? Wallpaper had been in use among the Chinese long before it was known in the west. It may have been introduced into Europe during the sixteenth century, but for long after it was both crude and little used. It was made in small which necessitated many clumsy joints and must have been far inferior to the tapestry, fresco or wood-lining it was meant to replace. Not until the eighteenth century did wallpaper become common in England; then, largely because it cheap, its use spread rapidly. The variety of designs included landscapes, pictures of classical statues and buildings, pictures and flowers, as well as imitations of marble and embossed leather. For long, however, the wallpapers most in favour were the beautiful patterns imported from the home of wallpapers - China.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.