article_snippet: Scroll down for video .
article_snippet: Architect Andrew Kinslow said that multiple floors were designed to look like tree debris being carried away by the twister.
article_snippet: If you think of St Louis, you think of the Arch.
article_snippet: In Seattle, you think of the Space Needle.
highlights_snippet: Green terraces would look like debris and LED lights make it appear to spin .
  