Warning: this is an htmlized version!
The original is across this link,
and the conversion rules are here.
-- This file:
--   http://angg.twu.net/LATEX/twot-boxes.lua
--   http://angg.twu.net/LATEX/twot-boxes.lua.html
-- From: http://wiki.luatex.org/index.php/TeX_without_TeX
-- (find-fline "$S/http/wiki.luatex.org/index.php/TeX_without_TeX.src" "following paragraph")

r1 = node.new("rule")
r1.width  = 20 * 65536
r1.height = 10 * 65536
r1.depth  = 10 * 65536

r2 = node.new("rule")
r2.width  = 20 * 65536
r2.height = 10 * 65536
r2.depth  = 10 * 65536

r1.next = r2
r2.prev = r1

vbox = node.vpack(r1)

-- http://wiki.luatex.org/images/Rulenode2.png