在读 TikZ 的 manual, 读到：

First, Karl had to download and install a package called pgf. Then it turns out that inside this package there is another package called TikZ, which is supposed to stand for “TikZ ist kein Zeichenprogramm”. Karl finds this all a bit strange and TikZ seems to indicate that the package does not do what he needs. However, having used gnu software for quite some time and “gnu not being Unix”, there seems to be hope yet. His son assures him that TikZ’s name is intended to warn people that TikZ is not a program that you can use to draw graphics with your mouse or tablet. Rather, it is more like a “graphics language”.

有笑到，好喜欢在这种奇奇怪怪的地方突然读到德语。