imagine

if you installed some kind of 3d camera system into a stem cell.
the type of system that projects the image all around you, like imax, or ironman 3.

and you sit back with a cup of tea and watch from the stem cells view, giving rise to all the other cells in the body. watch the cells move off into the distance to do their own thing.

you watch the entire existence of the stem cell, until the point where it stops self renewing and eventually dies.

you would be sitting there for quite a while, and you may run out of tea, but wow. it would be like watching the universe in action.