I think Disposition is about how your feelings change through life. Throughout most of the song, the tune is mellow, I think that means life is going good, so you feel happy and chilled, and take everything in. Towards the end of the song, however, the tune starts to get slower and darker until it fades, I think that is when something happens in your life to make you feel sad, so instead of taking everything, you reflect on what has happened, which leads into Reflection.
I think Disposition is about how your feelings change through life. Throughout most of the song, the tune is mellow, I think that means life is going good, so you feel happy and chilled, and take everything in. Towards the end of the song, however, the tune starts to get slower and darker until it fades, I think that is when something happens in your life to make you feel sad, so instead of taking everything, you reflect on what has happened, which leads into Reflection.