Recently, Apple unveiled their newest version of the glass staircase at their flagship store in SoHo, New York City. It is very impressive.
The staircase sides are made from separate panes of glass.
People were going up and down the staircase just for fun.
From a distance, the glass staircase does not seem like it can hold the weight of a full grown person. When you get up close, you see that each supporting glass wall is made from five 1.5-2 inch walls of glass laminated together.
Photos courtesy of hipstomp via core77.com