What does Gulliver do to help himself be able to see the people and buildings of the metropolis of Mildendo more closely than standing up?

Gulliver cut down trees in the royal park to make stools to move about and sit upon in order to see Mildendo more clearly.

"At the same time the emperor had a great desire that I should see the magnificence of his palace; but this I was not able to do till three days after, which I spent in cutting down with my knife some of the largest trees in the royal park, about a hundred yards distant from the city. Of these trees I made two stools, each about three feet high, and strong enough to bear my weight. The people having received notice a second time, I went again through the city to the palace with my two stools in my hands. When I came to the side of the outer court, I stood upon one stool, and took the other in my hand; this I lifted over the roof, and gently set it down on the space between the first and second court, which was eight feet wide. I then stept over the building very conveniently from one stool to the other, and drew up the first after me with a hooked stick. By this contrivance I got into the inmost court; and, lying down upon my side, I applied my face to the windows of the middle stories, which were left open on purpose, and discovered the most splendid apartments that can be imagined. There I saw the empress and the young princes, in their several lodgings, with their chief attendants about them. Her imperial majesty was pleased to smile very graciously upon me, and gave me out of the window her hand to kiss.