Wow it's amazing what a difference just a few days can make.  Last week you could set Calvin in his carefully baby-proofed room with some toys and head into the bedroom to get yourself dressed for the day, or head to the kitchen to wash a few dishes, or start the laundry.  Whatever the task, we never left him long, but we always knew where he'd be when we went back.  In fact, the farthest he might move was from sitting to laying, or maybe a couple of rolls away, but not so much now.  Now if you leave him in his room and go to get dressed you're likely to be snuck up on long before you are done.  Thankfully the house is mostly baby-proofed now, though there are a handful of things that are still out, like the dogs' dishes and Jon's music.  The new word of the week has been "no," and we've been pleasantly surprised by Calvin's reaction, which is this:  First he looks at you, pauses, then sits back away from the [fill in the blank], screws up his face, turns beet red, then starts screaming and crying with frustration.  Okay, we're not really pleased with the actual reaction so much as the fact that he does respond that way 95% of the time.