As we turned she pointed to an enormous fungus, on a tree, at eye level.
My immediate thought was that it was a mezuzah.
In the Jewish tradition the mezuzah is, rather than a talisman or charm, a reminder of God’s presence. It is a small case intended to be placed by the doorpost as a simple observance, a mitzvah. It contains a parchment with words that read … Love the Lord with all your heart and with all your soul and with all your strength. These commandments that I give you are to be on your hearts. Write them on the door frames of your houses and on your gates (Deuteronomy 6). If you faithfully obey the commands I am giving you I will send rain on your land in its season, both autumn and spring rains, so that you may gather in your grain, new wine and olive oil. I will provide grass in the fields for your cattle, and you will eat and be satisfied (Deuteronomy 11).
I thought the sentiment particularly appropriate, given the environment within which we found ourselves.