The attraction is pretty obvious: they are not concrete blocks nor are they glass cubes or molten mistakes. They have that olde worlde thing called character, and give the impression of having been designed or even constructed off the cuff, as the builder looked for whatever materials he wanted to offload at the time. You don't much get that anymore, I suppose, everything mass produced and costed down to that, with a payola priced in somewhere to keep the fathers sweet. We could consult the ginger man when he gets back from his big meal across the seas - he's sure to be able to enlighten us.
:-)