I called in at the Basel Museum of Architecture to see their exhibition Bengal Stream about contemporary architecture in Bangladesh.   In the early years of Independence, they employed major American architects, including Stanley Tigerman working with Muzharul Idlam at the Polytechnic Institute in Sylhet, Paul Rudolph at the Mymensingh Agricultural University and, most memorably, Louis Kahn designing the Capitol in Dhaka.   Since then, they have developed their own traditions of lightweight construction, designed, as far as possible, to withstand the consequences of flooding, cyclones and the monsoon, low-rise and often brick:-