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http://www.minecraftforum.net/topic/419852-new-seed-i-found-using-my-whole-name/#entry5835432
It's not an optical illusion, it just looks like one.
Nature Overhaul: http://www.minecraftforum.net/topic/191599-v166-nature-overhaul-v1011-cactii-fix/
and by defining realistic i mean there are no logs floating or being supported by leaves below or ontop of it.
http://www.minecraftforum.net/topic/419852-new-seed-i-found-using-my-whole-name/#entry5835432