3.14.1 Top new questions this week

3.14.1.1 How to draw a fish?

http://tex.stackexchange.com/questions/361547/how-to-draw-a-fish

I would like to draw an image like the following. 
This is what I've done so far (I used tikz, but any other package is welcome): 
\documentclass{article} 
\usepackage{tikz} 
\begin{document} 
...
 

- asked by CarLaTeX (33 votes), answered by Robert (22 votes)

3.14.1.2 How to add arrow in equations and matrix?

http://tex.stackexchange.com/questions/361375/how-to-add-arrow-in-equations-and-matrix

I just read a book "Linear Algebra and Its Applications 4E" by David C. Lay. The book is (should be) LaTeX typeset. The matrix and equations are so nice, please see the following 3 examples: 
...
 

- asked by Yangxin Zhang (19 votes), answered by gernot (31 votes)

3.14.1.3 How to create a Langton's ant in latex?

http://tex.stackexchange.com/questions/361838/how-to-create-a-langtons-ant-in-latex

I'm wondering if it is possible to create the different steps of Langton's ant, a cellular automaton, in Latex using TikZ or using other packages. For example like this:
 

- asked by Astrid A. Olave H. (14 votes), answered by Thruston (24 votes)

3.14.1.4 Hide part of the letters (LaTeX or LuaLaTeX)

http://tex.stackexchange.com/questions/362201/hide-part-of-the-letters-latex-or-lualatex

I'm trying to find out how to typeset something and then hide part of the words/letters, e.g. the bottom half, the top third, the first letters, etc... 
Is that possible?
 

- asked by Moriambar (11 votes), answered by Werner (13 votes)

3.14.1.5 Why does \L italicise differently compared to an ordinary L?

http://tex.stackexchange.com/questions/362349/why-does-l-italicise-differently-compared-to-an-ordinary-l

The following TeX 
\documentclass{article} 
\usepackage{amsmath} 
\begin{document} 
\[ \L, \operatorname{\L}, \mathrm{\L} 
\] 
\textit{ 
\[ \L, \operatorname{\L}, \mathrm{\L} 
\] 
\[ L, \operatorname{L},  ...
 

- asked by Henricus W. (9 votes), answered by egreg (7 votes)

3.14.1.6 Best practice for creating TikZ pictures with nested elements

http://tex.stackexchange.com/questions/362307/best-practice-for-creating-tikz-pictures-with-nested-elements

Context 
I want to create several diagrams to illustrate processes. They are not technically complex. However, they consist of several nested elements. First, macro-elements are relatively positioned.  ...
 

- asked by ebo (9 votes), answered by John Kormylo (5 votes)

3.14.1.7 Difference between \mathop and \mathord

http://tex.stackexchange.com/questions/361862/difference-between-mathop-and-mathord

Depending on this question I am totally confused now, when to define something as an operator or as an ordinary math symbol. egreg says in his comment that the identity function is to be used as an  ...
 

- asked by varsop (9 votes), answered by egreg (7 votes)