Richard Branson planning a glass-bottomed plane for Virgin.

no no no. My legs loose all strength and I fall to my knees in things/situations where I cannot see ground beneath me.

They have glass sections on the floor of the top observation deck of the CN tower in Toronto. I tried to walk on one while looking down but my body just refused to do it.

I wonder if I could do it now--my fear of heights seems to have mostly disappeared after I lost most of my depth perception.

There's something like that in the CN Tower in Toronto. I had to physically make myself do it. You try to move, and the body's like, "Hell, no, are you stupid?"

Edit: Strangely specific x-post!

No. Just no.

I would do it. I would be scared as heck, but I'd do it. That looks awesome.

Me, too. Total queen of the world moment.

I think I would be OK on a glass floor? My fear is connected to being off-kilter, so a stepladder is way scarier to me than a tall building.

There is a go fund me link for them that should be added - it is over $20K, so maybe not a link, but a note recognizing that not all people suck. It looks like maybe some of the funds will go to the org that trained the guide dog.

Thanks -- someone else sent me some links, too, so I should go post an update.

There's a psychological term for that -- visual cliff -- and they test babies (and other baby animals) for it by setting up a glass-topped table so it's as though the table ends. Below a certain threshold of brain development, babies will crawl over the edge with abandon.

A couple years ago I walked over a big grate -- the kind you see in parking lots -- only to find out when I looked down: somebody had left a light on in the shaft about 50 feet down.

I may even have yelled out loud. It was a very sturdy grate that trucks drove over all the time, so it wasn't any kind of dangerous. I leaped to safety and stood there for a while with my heart hammering.

Whereas I'm all, "Dude, that is cool."

Fear of exposure can be unlearned, you know. Not that anyone other than a climber or a professional tree-cutter or linesman would want to, I suppose. But if I stop climbing for a while and then go back, I have to retrain myself so that I don't freak out when I'm up really high on an overhang.

The Mackinac Bridge (http://www.mackinacbridge.org/), a five-mile long bridge that connects the two peninsulas of Michigan, has grating instead of pavement on the two inner lanes. When I was a kid and felt the car drive over it, the grate was just a noisy, vibrating annoyance. Then I went under the bridge on a boat and looked up. You can see the cars driving over the grate--and from the water (or a few feet above it) it doesn't look like they're driving over much of anything that would hold up a car. I've been a fan of the outer lanes ever since.