Is the background here at TeX.SX copyrighted? If not, does any one know about a MWE which replicates the background on the webpage? I have always been amazed at it and would like to use it as a background of a document. I did some search on the webpage and I was able to extract the .png file below:

enter image description here

I would like to use it as a background for letterpaper size documents. One of the diagrams seems familiar; the one with the triangle. If am not mistaken it is similar to the one from TeXample.net.


2 Answers 2


The chemical reaction : Oxidation/reduction arrows, overhead and below, with oxidation numbers also

Elvish text : What package allows Elvish in TeX?

The middle part : I think these are the images used



as one of them is mentioned already. Read more from the graphics design story here

Site Design Ideas (updated with mockup)

The rest looks like straightforward to replicate via math-mode, or I made it invisible during a simple contrast modification...

enter image description here



The (original) image was created using ePiX (available from CTAN). The source sphere.xp can be compiled using

elaps <options> sphere.xp

to produce

enter image description here


/* -*-ePiX-*- */
#include "epix.h"
using namespace ePiX;

const double k(2*M_PI/(360*sqrt(3))); // assume "degrees" mode

double exp_cos(double t) { return exp(k*t)*Cos(t); }
double exp_sin(double t) { return exp(k*t)*Sin(t); }
double minus_exp_cos(double t) { return -exp_cos(t); }
double minus_exp_sin(double t) { return -exp_sin(t); }

int main()
  picture(P(-1,-1), P(1,1), "2.5 x 2.5in");

  degrees(); // set angle units
  camera.at(P(1, 2.5, 3));

  sphere(); // draw unit sphere's horizon

  pen(Blue(1.6)); // hidden portions of loxodromes
  backplot_N(exp_cos, exp_sin, -540, 540, 180);
  backplot_N(minus_exp_cos, minus_exp_sin, -540, 540, 180);

  backplot_N(exp_sin, minus_exp_cos, -540, 540, 180);
  backplot_N(minus_exp_sin, exp_cos, -540, 540, 180);

  pen(Black(0.3)); // coordinate grid

  for (int i=0; i<=12; ++i) {
    latitude(90-15*i, 0, 360);
    longitude(30*i, 0, 360);

  bold(Blue()); // visible portions of loxodromes
  frontplot_N(exp_cos, exp_sin, -540, 540, 360);
  frontplot_N(minus_exp_cos, minus_exp_sin, -540, 540, 360);

  frontplot_N(exp_sin, minus_exp_cos, -540, 540, 360);
  frontplot_N(minus_exp_sin, exp_cos, -540, 540, 360);


Possible outputs:

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