Story is simple.
The target was dish - plate or how to say it in English, simple flat rouded piece. It has happened that due to mistake was one side crippled ane overlapped the plate - as you can see at picture.
Wow - people said - isnt't it nice? It is something new, plate with one side ovelapped.
Soon it was presented in journals as designed plate, rather than waster. The first wa accident, than came idea.
This story told me Frantisek Vizner when we together looked at simmilar piece in Nove Mesto na Morave museum last winter. Also my friend Marcus Newhall was there and I suppose he can can confirm the story.
Jindrich