Every year, Tom Phillips puts up a slide of Dublin’s docklands for his students in UCD’s School of Architecture, Planning and Environmental Policy.  Phillips, an adjunct associate professor, asks his class to identify where is Capital Docks, Ireland’s tallest residential tower, at just 22-storeys.  “Most of them can’t find it,” Phillips said. “It is not evident because it is not very big. The very place we should be building tall buildings is Dublin’s docklands, but we’re not.”  About a week ago, Phillips watched as developer Johnny Ronan’s plan for two high-rise towers in Dublin’s docklands was turned down by An…