A quadrilateral with two parallel sides - that's a trapezium (according to the brits; the yankees don't think so).
However this geometry lesson has little to do with the fair & lovely set. The trapezium outlined in the Google Earth image above is the part of Belghoria (in the northern suburbs of Kolkata) where I grew up, early 60s to late 70s.
There were occasions when what lay within the 'trap' stood for me as the very image of stagnant, uncelebrated decline. But on other occasions, especially till one's primary school, the limits of the quadrilateral (and further afield) held for me the very real promise (often fulfilled) of adventure and pleasure.
to be continued ... ... ...