Loving and being loved are sometimes all the security we need.
My brother had a koala bear that he loved the hair off, refusing to sleep without Char until he was an older boy. One of his sons was similarly attached to his stuffed dog which started out as quite a fluffy hairy animal but not is somewhat threadbare with its hair worn off. These animals acted for both as a security blanket. With the animal present no harm could befall them, even allowing them to sleep safely.
For others walls are needed to give security.
For others the wall is not enough.
From the youngest and poorest to the wealthiest and most important security is important to all.
In response to WP weekly photo challenge