Portals to Another Dimension?
The mere sight of this can have your eyes turning and have you quite dizzy. What’s causing the glass to appear like this? Is it something on the window, or outside of it? We even briefly considered that was caused by bullets, but that didn’t sound quite right. Whatever this is, these windows are interesting.

provided by constative.com
So interesting, someone decided to share this photo online and inquire about the odd shape of these windows. As it turns out, in the old days, windows were made by spinning molten glass until it was flat. Those points on the glass are the points of spinning. Good thing we have better ways now.