I chose page 21 because I was fascinated by the correctness and the precision with wich Johann Christian Senckeisen has drawn this visualisation of the corinthian column. Page 22 and 23 describe the characteristics of the corinthian order and compare it to the other orders. Here he concentrates on the capital and explains the association with the abacus flower.
Another reason why I chose to present these three pages is because of its layout. At first you see page 21 with the different visualisations of the corinthian capital and as you turn the page over you get the description and Senckeisens idea and thoughts to page 21. This appears very clear and logical to me.