Answer:
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
I am used for light yet I am solid. Without me you would feel enclosed. I hate being touched especially with a lot of force. I like to be in buildings.
What time of day, when written in a capital letters, is the same forwards, backwards, and upside down?
I am in the past never in the future. I don't exist but have existed. I saw what you saw and that is what I will ever see.
I can fall off a building and live, but in water I will die. What am I?
My days are numbered. What am I?