One sketchbook — or many? NOTE TO SUBSCRIBERS: After 152 issues, Studio Notebook will cease publication at the end of this year. Danny's Essays, my free newsletter, will continue each week. You will no longer be charged for your subscription, but I shall continue to send out Studio Notebooks till the end of December. I will fill you in further on this decision in the remaining issues. Thank you so much for being a paid subscriber — your support has meant so much to me! Hi Reader: I used to be...