Under Construction
"It represents this utterly different philosophy that you need to know that this site is under construction, it's not done yet. Now, we know all sites are not done. If your site is done, something is wrong. It's bad. You're either out of money or you're boring." —Jason Scott, a historian at the Internet Archive.
The "under construction" gif is essential to the early internet webpages. Gifs like this are used as early UX guidance for the user. It is an example of early internet 3D motion graphics.