One of the practices my current Star Wars GM implemented in our first game was to occasionally stop when describing a scene and having we the players add details to the scene. Unfortunately there were only a few opportunities during the last session to put this technique into practice, but when we did it proved an excellent tool for getting everyone involved into the scene.
As the gamemaster, I typically can envision every scene in the games I run, from surroundings to mood to weather to supporting cast. However in my experience can be easy to fail to fully communicate this to my players. Maybe I skip over something that for me is a given based on my other descriptions but isn’t for my players, or maybe I just get so wrapped up into detailing one aspect of the scene that I forget to describe another. It’s never intentional, but sometimes it happens. Regardless, I can already see how I will be able to leverage this collaborative scene building technique in the future to help improve my own game.