Further reading
The following sections in the TikZ manual at https://texdoc.org/pkg/tikz are relevant to this chapter:
- Part III, Section 23.1, Transparency covers transparency, blending colors, and so-called fadings—non-uniform transparency. The online link is https://tikz.dev/tikz-transparency.
- Part V, Section 45, Background Library is the
backgroundslibrary reference and is available online at https://tikz.dev/library-backgrounds. - Part IX, Section 113, Using Layers explains declaring and using layers in the basic PGF layer, to be found online at https://tikz.dev/base-layers.
The TikZ galleries (https://tikz.net and https://texample.net/tikz/examples) contain many examples using features of this chapter; those collections have layers, background, fadings, and transparency tags.
The tikzmark manual can be found at https://texdoc.org/pkg/tikzmark. The atbegshi manual is at https://texdoc.org/pkg/atbegshi.
The transpose of a matrix, for which we made...
