You found it Greene, congratulations.
It's all about empowerment, and knowing how to go about identifying something is the beginning of success.
My aim is to help the process, it becomes enormously satisfying when you get results.
Keep one of those chairs handy Greene, and put your outside light on at night when it's good weather so you can stand on the chair to take photos when the moths turn up. Believe me, there is nothing more satisfying than standing on a chair watching moths turn up on a balmy warm night while they flit up the wall or bomb you in their excitement.
Odd thing isn't it Ann, the mind boggles as to what shape it requires to extrude such shapes. A toothpaste tube comes to mind, one of those which make the stripes as it comes out but without the stripes.