Seems that sheet-metal tubes are all the rage around here these days. This ventilator construct (click for bigs) was pointed out to me by noted photographer Frank P. Hamilton. In fact, he showed me his photographic rendering of this and I confessed at once that I intended to poach his pixels when he wasn't looking. Ever the accommodating gentleman and dedicated photographic educator, Frank helped me locate the Big T with the help of Multimap. He then gave tacit approval for my evil plan to totally plagiarize his work. Whatta guy! Thanks, Frank!
Thus spake the rabbit.