1) It is manmade.
2)
<EDIT>Most of them do not need electricity.
3) Most of them are not made out of metal.
4) It can be found in the average household.
5) It could not be considered dangerous.
6) It is larger than the average pillow.
7) It was not invented in the past 100 years.

It is not a door.
9) It cannot be found in the average kitchen.
10) It is not a table.
11) It cannot be found in a bathroom/restroom/loo/water closet.
12) It can't be bought at home improvement stores.