In my last column, I discussed some of the facets of self-determination that arose through looking at the wonderful Belfast artist Colin Davidson and his most recent work exhibited in Dublin and London. This week, I have been thinking more about the realignment of global powers and, more specifically, the nature of war. And even more specifically, the nature of defence investing. IMMA with its new exhibition has given us a reflection on the wildly complex changes that we, individuals, communities, economies and nation-states have undergone in the last hundred, and even thousand, years at the planetary scale. Its introduction…