@Sally: Yes, you really got it, the whole point is to move it around when needed, but hopefully not too much moving because I hurt my back recently (not a big deal but still prefer not to be carrying heavy objects). I am glad you can think of some use for this design, it was designed around covering up fresh chicken manure odor's while at the same time leach a little bit of nutrient every time you water the pot(I heard we should age the manure first but I never put them on edibles only flowers). It was designed to have many pots at many different places of the garden, but minimal moving if I can help it : - ) When it is raining too heavily and you don't want the pot to leach out too soon, you can cover it with something, like softwood planks etc.,and then you might be able to sit on it like you said(hopefully the pot is sturdy).
