A cover around trees that is also used to guard the tree, that the land in which the tree is planted will not be too tight, and that water and oxygen will reach the roots of the tree more easily.
Note that this tree grate is in its expanded form, in 2020 an almost identical tree grate, but without the central part was photographed at 234 David Ben Gurion Street, Givatayim, Israel Click for a larger image
Translation of the text on the cover: Merkaz Hayeridim (Expo Tel Aviv) Vulcan - Dafna model