1。 The convex mirror is used to push the brake gas out of the outside.
2. The flat mirror is used to reflect the brake gas.
Concave mirror is used to absorb the wealth from outside.
Your toilet can be separated from the door by building a porch and screen, then hang a string of bead curtains on the toilet door and install a door closer on the toilet door, so that the door can be closed automatically at any time.