Speaking of walking on glass, there was an ad on Facebook yesterday for a window for your home or apartment. It looked like a conventional floor to ceiling window with a horizontal bar across the middle. But at the press of a button, the lower half folded out to form a glass bottom balcony, the top half becoming the balustrade. I don't recall how the side panels were created. The effect was similar to Skyview at the top of Eureka Tower in Melbourne.