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Special "wallpaper"
In Bosch's time, there was no wallpaper. To decorate the wall, figures were painted on the wall by hand. The painting on this wall on the second floor consists of squares. The squares are divided into four parts by two diagonals. Each of these quarters has a different color, ranging from black and dark gray to light gray and off-white. This has created a kind of diamond heads, which give a three-dimensional effect. Therefore, the checkered paintings are also called diamond heads. To decorate the bottom of the wall, an ornate plinth was sometimes painted.
From the middle of the nineteenth century, paper wallpaper was used extensively 
In those days, wallpaper was often laid on a base of jute 
Diamond heads from ca. 1465 
Hand-painted plinth from the 17th century
