The Wandering Mind is the last thing to go.

  Reading email titles as I clean my email list I see OPEN CULTURE. Sometimes new and interesting stuff there. Here's one to check out. Leonardo Da Vinci’s To-Do List from 1490: The Plan of a Renaissance Man. (qv)   The list is stuff I know nothing about, nor care. I do observe that the list reflects  Leonardo's reputed fascination with and possible mastery of Mathematics.

[Calculate] the measurement of Milan and Suburbs

[Find] a book that treats of Milan and its churches, which is to be had at the stationer’s on the way to Cordusio

[Discover] the measurement of Corte Vecchio (the courtyard in the duke’s palace).

[Discover] the measurement of the castello (the duke’s palace itself) 

Then I come to this one:

Get the master of arithmetic to show you how to square a triangle.  

 Well, that seems simple. So I google it. I read several algebraic formulae for squaring a triangle, none that I can work out any more, although they are, after all, simple. I acknowledge to myself  that the math part of my brain is non compos (not yet the whole brain, but, at least this morning, the math  calculating part). Then I come across this:  https://www.youtube.com/watch?v=sAPUYeTBpdw

Be patient, I tell myself, it has pictures, the solution will come. And it does, sort of. And I think how I'd love to have him as a teacher. I might have to ask him to slow down, Indian speaking English, you know.

And then comes an explanation of the golden ratio, with folding paper. Different teacher here. I find this fascinating but am not really absorbing the rules.  I notice the teacher has tattoos on his fingers. And his hands are bruised and stained. They look more  street fighter than  mathematician.  I continue watching, my thinking mind foggy, just listening to the voice and focusing on the yellow paper being folded. 

I go to the bathroom, get a Diet Coke, return to my setup for the day.  Comfy chair placed so my eyes are  2 feet from the 50 inch screen of  my TV, which is  sitting on  a bookcase that lies long side to floor. My feet  are propped on shelves of bookcase. There is a TV tray pulled over my lap with tiny keyboard and mouse on it. Also TV remote control. 

Side table to right with Diet Coke,  papers, spectacles, eye drops, lens spray and washcloth to clean lenses. Pillow to hold me forward in chair.

It is harder to read on a screen this size because one's eyes must travel to the sides more, but any farther away and the print is too small.

Writing brain tired now. Also eyes.  Later.

This took f-ing forever and is a mess. I am getting slower and slower.