I once came across an accordion on eBay that looked like an ordinary piano accordion, except that, instead of the normal layout of black and white keys, the keys alternated between black and white symmetrically, so every other key was a black one. It was like a child's drawing of an accordion come to life. Clearly the person selling it had no idea that it was unusual in any way. I really wanted it, but didn't get it. I wish I could remember the brand. Anyone ever seen one of these?