The edge ripples the whole way round, as though a square of cloth had been dropped on the table and left where it fell. Nothing about it is straight.
The cats gather along one side only and the rest is left clear, which is the useful part. It suits two or three of something rather than a meal: a couple of slices of cake, a few pieces of grilled fish, whatever is put out beside the tea.
Turn it over and there is a fine net texture pressed into the foot, and the mark of the kiln that painted it.