Details that make you wonder

Some time ago I took a series of pictures of baobab trees (some of which are here). There were meant to show how impressive these savannah giants were, and I didn't go into too much detail, but something puzzled me at the time, and I still find it quite extraordinary.

On the trunk of this tree:

I saw what looked like warts, and looking closer, realised that a branch seemed to be growing out of each of these nodules. 

Strange and intriguing, don't you think?