A lot of the work used in Quiver is original Valve content. Development seen on the Moddb does not necessarily represent the current/finalized progress of Quiver.
Seldom seen by most HL fans, this is the alpha version of the test chamber when the chapter was titled 'The Portal Device.' It's strange how Valve let you see the stars from a few miles underground.
When I showed this to Gabe Newell of Valve, he simply commented: "Blast from the past."