I had to photograph this bit of graffiti in the toilet of the Uffizi gallery even though the light was not great. I have spent a good deal of time in my class (The Art of The Visual Journal) talking about drawing and in particular perspective in part because Florence is the birthplace of perspective and also because I have been working every day while in Florence on a book devoted to drawing, perspective and design visualization. It was outside the Baptistry (adjacent to the Duomo) that Brunellschi validated his hunch with regards to perspective by drilling a hole in the back of a painting of the building and holding a mirror behind the painting to reflect the actual building back to see if his perspective in the painting fit exactly with the actual reality of the building. It did of course and years later Alberti codified that validation in his book Della Pitura (On Painting).
The 'real' David as exhibited at the Galleria dell'Accademia is now accompanied by a computer model (simulation) which allows the computer version of David to rotate as it is projected on a small screen......all of which is made possible by perspective and the science of optics (not to mention computer code- another entry for later). So it was hard not to cringe looking at this display when the work itself was ten feet away and far more majestic. You have to draw the line somewhere and I would say draw it there- let the work speak for itself instead of interpreting it through the computer software that relies so heavily on the codification of perspective. Though linear perspective is now really old (over 500 years) and we have replaced it with virtual tools, the real thing is often far more compelling than anything technology could provide at this particular moment.