▁possible ▁pan es ▁of ▁glass ▁were ▁used , ▁there ▁are ▁no ▁sp and rel ▁pan els , ▁and ▁the ▁m ull ions ▁are ▁minimal . ▁C obb ▁added ▁a ▁geometric ▁modern ist ▁tw ist ▁by ▁using ▁a ▁par alle lo gram ▁shape ▁for ▁the ▁tower ▁floor ▁plan . ▁From ▁the ▁most - common ▁views , ▁this ▁design ▁makes ▁the ▁corners ▁of ▁the ▁tower ▁appear ▁very ▁sharp . ▁The ▁highly - reflect ive ▁window ▁glass ▁is ▁t int ed ▁slightly ▁blue , ▁which ▁results ▁in ▁the ▁tower ▁having ▁only ▁a ▁subt le ▁contrast ▁with ▁the ▁sky ▁on ▁a ▁clear ▁day . ▁As ▁a ▁final ▁modern ist ▁touch , ▁the ▁short ▁sides ▁of ▁the ▁par alle lo gram ▁are ▁each ▁marked ▁with ▁a ▁deep ▁vertical ▁not ch , ▁breaking ▁up ▁the ▁tower ' s ▁mass ▁and ▁emphas izing ▁its ▁vertical ity . ▁ ▁In ▁late ▁evening , ▁the ▁vertical ▁not ch ▁to ▁the ▁north west ▁catch es ▁the ▁last ▁light ▁of ▁the ▁sky , ▁while ▁the ▁larger ▁port ions ▁of ▁glass ▁reflect ▁the ▁dark ening ▁sky . ▁ ▁A ▁major ▁concern ▁of ▁the ▁architect s ▁while ▁design ing ▁the ▁tower ▁was ▁its ▁proxim ity ▁to ▁Boston ' s ▁Tr inity ▁Church , ▁a ▁prominent ▁National ▁Historic ▁Land mark . ▁Their ▁concern ▁led ▁them ▁to ▁red es ign ▁the ▁tower ' s ▁plans , ▁as ▁there ▁was ▁a ▁public ▁out c ry ▁when ▁it ▁was ▁revealed ▁that ▁the ▁Han cock ▁Tower ▁would ▁cast ▁its ▁shadow ▁on ▁the ▁church . ▁ ▁Engineering ▁fla ws ▁ ▁The ▁building