Petri's box

It was a very nice town ... very neaty ... rounded by heavy walls by ancient times ... to protect from others ... the walls have disappeared nowadays ... but i looks still like a Petri box ... you knox the one that is used in laboratories ...round ... flat ... transparent to let light go in ... closed to prevent things entering or things going out ... with a feeding solution... and bacteria to see how they behave ... they grow, live and destroy each other ....

but it's a very nice town ...