look for the ceiling but see a sky instead, with concrete clouds .. rectangular clouds in a geometric dome forming a half-cylindered tunnel in the underground ..
the descent into the underground is by way of broad formal stairs, several levels .. people move quickly up & down the stairwells .. the main floor opens unto a concrete cavern revealing additional layers; platforms, stairs, tracks & trains; trains stationary & trains in transit .. tickets are available by machine or by the central kiosk which is peopled .. green line red line & blue; follow the broad painted arrows & study the sensibly planted maps as while walking to the primary platform for waiting ..
the space in an afternoon;
while waiting for a train
it is not very wide
that, which has been carved out
though quite deep & with crevices
filled with striking holes