Can anyone help me with the meaning of the phrase "to take on a momentum of its own"? Does it mean "to start to continue its progress on its own without external assistance" or something like this?
Context:
"Artists will recognise how an artwork evolves from the first few tentative marks on a blank page, establishing constraints as it proceeds, out of which a more complex picture emerges, which then goes on to provide a narrower number of options until it seems to arrive at a kind of inevitability, one which may even take on a momentum of its own."