To summarise this thread for enthusiastic young trainers, in case they don't have time to read the whole thread:
Basically it's all about switching up your routines, and adding mad weight to shock the muscles into growth mode and keep your body guessing. Hit the muscles from every angle and don't leave the gym without using the cables if you want the sculpted look. Eat at least 8 small meals per day, 1.75 grams of protein per pound of lean bodyweight, chew your shakes to trick the brain into meal mode, and keep your supplement cupboard filled so your body's getting all it needs to mutate. Sleep for at least 12 hours so your bicep peaks can fully recover from the extra inch per week from hitting that head, and the extra length it's grown from full ROM genetically altering EZ bar curls.