Or is it Kairos Shen’s love of glass towers? Either way, the Globe’s Rachelle Cohen rightly isn’t happy with the Wu administration’s proposal to allow giant glass towers in Downtown Crossing – and the controversial way the proposal came about. … More on the height-rule plans at BisNow-Boston.  … I touched upon the same issue a few weeks ago (scroll down to ‘Not quite NIMBY-ism …’).