edge

What's up with these sinkholes, I wonder. Apparantley the one in Assumption Parrish Louisianna is still growing. Now they can't all be caused by the same thing, can they? Sure makes one wonder though doesn't it. You all out there that's good at connecting dot's let me know what you think...

Sometimes an edge is a corner, in which case you do not fall off. Corners are achieved by urging one plane into another, then feeling slatted and fenced (fig. 1). The planes feel otherwise, each at its own tilt. Sometimes an edge is a border, in which case you see more of the same...