The Edge at Eureka will open to the public on May 15 as part of an observation area on the 88th floor of the Eureka Tower apartment block in Southbank.
The glass walls, ceiling and the floor start opaque and gradually become clear as the cube fully extends three metres from the side of the building.
Soothing music followed by the sound of grinding metal and breaking glass were used for sound effects during the media preview ride today.
Project director James Cockburn said he wanted visitors to the observation deck to experience something unique.
"We're trying to go from comfortable to scary. We're sadistic I suppose," Mr Cockburn said.
"We've got an experience that is more than the view."
The Edge was built from two tonnes of 45mm thick glass reinforced between steel framework. The 2.1 metre by 2.6 metre glass cube can hold up to 10 tonnes and withstand winds above 70km/h.
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