@ MadCook------ that 'perch' sounds like something I could use. Can you remember anything else about it so I can go searching the Internet? I'll look in the Adaptive Devices links on Google to see what comes up,
The reason I don't use a stool is the fixed height and the hard seat. Can I say coccyx? Of course a pillow or special pad would help.
The strangest thing----- when first taken ill and attendant woes with sitting I kept thinking about sitting in my English saddle. (Go figure) My husband brought in a saw horse and put the saddle on it----- I managed to get onto it and wow----much less pain, even without having a back.
Riding English style demands that a person sit in a 'perfect position' that can't be done on any chair! Naturally I don't have my English saddle here. LOL Or my horse.