in which the sum is greater than the parts

Leni likes to lie in the T-position (or modified t-position, as illustrated in this photo).

This is not conducive to rolling.

But, when she remembers how to arrange her arms, she is now quite proficient at going back to front to back again, so she ends up in a different spot than when she started. At our fitness class, this means I look up to find her lying on the gross floor, as opposed to my carefully placed blankets. At home, it means we check on her and find her sucking on my shoes. Up to this point, the fact that she finds herself in a new place is a delightful surprise - look! there are new things here. But I am sure that soon, much sooner than we are prepared for, she will realize that rolling means moving, and that she can get herself wherever she would like to go.