Google Testing New Refinement/Clustering Links — Sign Of Google Base In Web Search?

Maybe it’s new — maybe not, but another Google query refinement test is out
in the wild, as covered in our SEW Forums thread
Google
Refinement Keywords
. There are links to screenshots showing that after a
search, a "Quick results" area appears at the top of the page with links that
seem to narrow refine results into clusters/topics. Something similar was
seen last month.

The topics and implementation resemble what happens after a search at Google
Base

, such as with
apple,
which brings up this at the top of the page:

Refine your search: 

products
  

housing
  

homes for sale
  

apartments
  

wanted ads
  

services
  

It makes me wonder if the refinement is going along with some Google Base
material flowing into the main web index as part of a test.

Related reading

Google I O 2016 on Google
A graphic showing the old Google logo superimposed over a faint search results page.
Shift London
471de69559512ff4f56b896ccedc6389