Thanks for your interest. Yes, the blue wall is a back-painted glass. We installed it so the surface is continuous with the mirror next to it and the custom medicine cabinet next to that.

We ordered the back painted glass from a company that paints it professionally on the back. Yes, and then our contractor installed it with grout similar to a tile.

This has been very functional in this bathroom, which is a guest bath and children's bathroom. As you can see there is not a shower. I do not think I would have installed it in a shower.

No grout is showing at the edges. We detailed the corners to make sure none would show.

As far as the expense goes, you could expect this to be similar to a moderate to high end tile wall.

I hope this answers your questions!

thank you so much for your time. I just realized i hadn't responded...lol