When cutting down the tree, you always need to saw off the first clue shaping
like a "pointed bracket". This piece of wood is what lumberers call "undercut" and thrown away then and there.
"WHERE TO START Glass" is a wineglass made with this undercut.
The stem of the glass stands straight supported by a chip of the undercut. It paradoxically explains that a tree cannot stay standing when it's got a little notch.
In fact, even a large tree can be easily cut down with this "pointed bracket".