Vistaprint (VPRT) has formed a base-on-base pattern, which it cleared on Friday. After breaking out of a base in September, it started work on a new base before rising 20%. When a stock does that, the second pattern isn't a different base. It's all a single pattern and doesn't add to the base count. It's called a base on top of a base. "What happens is that a powerful stock breaks out of its base and advances, but is unable to increase a normal