Yeah. Whenever it happens to me, it can be disorienting (and sometimes frustrating). But it is a good sign. A very good sign. It shows me that I'm on a tipping point where I will either fail or get a little better, and that eventually I will push past that boundary if I keep going. The fundamentals (rules/constraints) are necessary as they get you to a place of freedom...where you can find out that you don't know anything, and start to truly be creative. I imagine the levels of discarding what you previously thought you knew will be endless.... fun! ;p