At the end of UT’s 142nd birthday week, here are 10 of the Tower’s most iconic lightings. First Tower LightingOct. 19, 1937The Tower is officially illuminated for the first time. Tower Windows Spell “UT”Nov. 22, 1962The Tower’s windows are used to spell out “UT” for the first time. Fireworks for CommencementMay 1995At President Robert Berdahl’s direction, spring commencement was redesigned to include fireworks and a display of the graduation year in the Tower windows. Creating a number in the Tower windows involves configuring 217 window shades.