An Embarrassment of Riches

I just wanted to provide a glimpse of the joy of having three sketchbooks on my hands this morning -- my sketchbook from our workshop with Petr, the project sketchbook Petr sent me, and my new project sketchbook which started making its way to Monaco this afternoon. I laughed out loud at one point because I kept having to open them up to remember which one was which (and to be sure I didn't send out the wrong one!). Petr, you must have a ton of these -- do you put little marks on them to tell them apart?