Yes, SOG stands for Sea Of Green. The method behind that is packing a lot of plants, usually clones because they work best and are the cheapest way to do it, into a small area with a screen above that the plants eventually grow to fit under. Then when you hit flowering, only the flowers poke thru so the top colas are what are absorbing the majority of the light.. usually increasing the yeild.. but i've never messed around with it, just going off what i read.