Nodules

gistfile1.lua

-- A converted javascript (by Keith Peters) adapted for Codea by Bri_G
-- ref. http://www.bit-101.com/blog/?p=3214
-- excellent description given note - retained background used

function setup()
    -- system and variable initialisations
    displayMode(FULLSCREEN)
    backingMode(RETAINED)
    wide = WIDTH
    high = HEIGHT
    pts = {}
    points = 100
    nopts = 1
    max = 150
    bckgnd = "FALSE"
end

function draw()
    -- background not used so network built up from start 
    -- normal or inverse colouring can be used
    -- rem out the next 4 lines for black background
    if bckgnd == "FALSE" then
        background(255,255,255,255)
        bckgnd = "TRUE"
    end
    -- generate a random point on the screen
    temp = vec2(math.random(wide), math.random(high))
    -- loop to check if new point networkable with dist < 150
    -- checks for each point in the array
    for i = 1, points do
        pts[i] = vec2(math.random(wide), math.random(high))
        dx = pts[i].x - temp.x
        dy = pts[i].y - temp.y
        dist = math.sqrt(dx*dx + dy*dy)
        if (dist < max) then
    -- change the number in lineWidth to modify display
            lineWidth = 5 - dist/max
            strokeWidth(lineWidth)
            stroke(218, 43, 53, 20)
            line(pts[i].x, pts[i].y, temp.x, temp.y)
        end
    end
    nopts = nopts + 1
    pts[nopts] = temp
end

This file was produced from a javascript file by Keith Peters. It was adapted for Codea by Bri_G
ref. http://www.bit-101.com/blog/?p=3214
The reference page gives an excellent description of it's construction
note - retained background used to produce the required cumulative effect, use of background for each draw() pass gives minimal flashing output.
I think this looks better in inverse colouring red on black background.
Don't run it too long - heavy on CPU usage