Why did Gulliver make the stools?

Gulliver made the stools to use as stepping stones, which would allow him to enter the palaces innermost courts and see their beauty.

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.