I use a network that is monitored and filtered by Cyberoam. The use Cyberoam to block some websites, and some content. 

I came to know of the antigravity easter egg recently. I tried it using  'import antigravity' and it opened the xkcd website as expected, but did not display the picture. I was able to view the image, when I changed the URL from http://xkcd.com/353 to https://xkcd.com/353 
I found that I could not view the image as Cyberoam (for some unknown reason) blocked the loading of the picture for the HTTP site.

If it does not cause any compatibility issue or other issues, please change the URL in  the antigravity library also to a HTTPS one. I request you to change this as this may go unnoticed to other people who are not aware of it.

I have attached a patch that changes the URL. You may use it if it's ok changing the URL.