Valve's "Aperture Science" VR demo, illustrating the capabilities of its SteamVR platform, is now viewable online.

Many people have had a chance to try the five-minute demonstration at trade shows and the like, but it's so far only been whispered about in public.

ValveTime filmed its experience with the demo, and has posted the results to YouTube.

The video is sourced from shaky cellphone footage, and features commentary rather than in-game sound, but it does give an impression of what happens in the demo: pushing and pulling in-game objects, and being interacted with by the likes of Atlas and GlaDOS.

HTC's Vive VR headset, developed alongside Valve, is set for release in the holiday season of 2015.