Certain blocks have individual clear protrusions allowing verticle connections of light conduits while others have lateral conduits and all clear protrusions.
Programable illuminating base sold seperately.-- 2 fries shy of a happy meal, Jul 20 2011 Prior art. LED_20lego [2 fries shy of a happy meal, Jul 20 2011] Lego set 8456: Fiber Optic Multi Set http://www.peeron.com/inv/sets/8456-11996 [notexactly, Mar 25 2018] Clear Lego bricks used to exist (I had a bunch in the bucket when I was a kid), though I'm several years behind on my knowledge of Lego tech. The fiberoptics can be kitbashed from lighting systems for model train layouts. This is definitely home-bakable.-- Alterother, Jul 21 2011 random, halfbakery