I've taught mine to use ordinary flush toilet. Although he doesn't understand flushing and can't push the button (just meows for a human to assist), still needs

I've taught mine to use ordinary flush toilet. Although he doesn't understand flushing and can't push the button (just meows for a human to assist), still needs to do a few scratching paw motions to soothe the nerves, and sometimes (no idea what he thinks, to me it seems like a completely random behavior) "forgets" about flush toilet and wants a litter tray, it's quite awesome. No litter whatsoever, obviously.