That page contains a description and the name of each generator.

Each chart here shows 30,000 pseudo random numbers between 0.0 and 1.0, which were produced using different random generators. In each chart, these 30,000 numbers are placed into a three-dimensional cube in the following way: Three sequenced numbers form the X-,Y-, and Z-coordinates. Then all 30,000 numbers are placed within the cube. An observation of all sides of the cube can produce a discernable pattern.

The names are in alphanumeric order:

• 161278
• DERIVE
• DRAND 48
• KNUTH, #1
• KNUTH, #2
• MERSENNE
• PHP RAND()
• RANDU
• SIMON, #1
• SIMON, #2

Take a look at this wiki page and do some googling to find more about these pseudo-random number generators. Of course you can use any PRNG you want.

The basic process is as described. For each random number generator:

1. Generate 30.000 random numbers between 0.0 and 1.0.
2. Each sequence of three numbers is an xyz-position. Thus there are 10.000 points.
3. Place the 10.000 points in a cube.
4. Take a picture of the cube from all 6 sides.
5. Place all the pictures on top of each other.
   

For bad random number generators, you will see a pattern.

For good random number generators (such as Mersenne Twister), you will not see a discernable pattern.

Thank you for your help!   Now very clear

> Take a picture of the cube from all 6 sides.

3 of the sides will just be the same as / a reflection of their opposite sides, assuming an ortho projection. so this is really just plotting x, y and x, z and y, z on the same square. maybe add some colouring for 'depth'

> Place all the pictures on top of each other.

it doesn't say that 8) i think he just chooses the view with the most discernible pattern

I guess you are right kooogy. I read/typed too quickly with my proposed process. Just a single view will do fine.

meomelo, there is no plotting device, but you have all the methods from the reference at your disposal to create whatever you want. You can draw a cube with the box() method, you can draw a point with the point() method. However in this case I guess it really is only a virtual/conceptual cube not something that you actually draw (although you could). Take a look at all the examples that come with Processing so you can see what can be done with it.

The best strategy to get something done is to start with something very basic and then gradually, incrementally build and build it into something bigger and more elaborate. Processing allows you to do this. Once you have some code you can ask more specific questions in the Programming Questions section.