Springform pot

A Springform Pan is a baking pan where the rim and the bottom panel are separate parts. The rim has a spring loaded latch that allows clamping it onto the bottom. The same principle, perhaps with additional high temperature silicone seals could be used to make a height adjustable pot. You start with a simple shallow frying pan as the bottom part. Then you clamp on rims to the desired height to make it a pot. Each rim adds about 2inch. There could also be pierced “bottom” panels that can be put in at different heights to make a multi level steamer (similar to those Chinese bamboo towers). A rim with a closed bottom panel would make it a plain Springform again. The top rim can also seal onto the lid to make a moderate pressure cooker (walls are too thin for real high pressure)

No need to buy a whole series of bulky pots any more. Dirty pots can be broken down into smaller pieces for easy placement in the dishwasher. Rims snap around each other for compact storage.