Cover of Modern Bookbinding Practically Considered, 1889. This L?on Gruel binding on a volume by William Matthews about modern bookbinding techniques displays a variety of styles produced by Gruel's workshop, intended to show the range of effects that Gruel could achieve for his clients. The front cover displays modern designs, while the back cover showcases antiquarian ones. Both covers feature modelled leather, a technique in which the leather is stretched and shaped to create depth and texture.