Both the BL9 and BL5 was "inspired" by function. Quite simply the optimum shape for these loudspeakers -- the oval of the BL9 and the circular shape of the BL5 is the result of a conscious attempt at avoiding standing waves within the cabinets, distorting the sound. The tapering is due to the hardest working and largest drivers being placed at the bottom, with the smaller drivers and tweeters going above that again.
The fact that the speakers resemble a Dalek, or a lighthouse, is just visuals. (Though B&O did make a point of it in Portugal, for the dealer meetings last year, where the BL9s were introduced with a helicopter flight towards a lighthouse).
A major point was made of the fact that the BL5s were the first speakers from B&O to have been shaped by function, rather than the shape being presented to the engineers as a challenge to fit the technology inside.
Lego for Earset 2? Not sure -- again I think function is playing a trick. They use the circular "casing" to hide the circuitry and batteries -- and it serves the additional function of covering the entrance of the ear, in order to blanket extraneous noise while you're listening.
Lewis was inspired to create the shape of the BC2 by a sculpture he saw in Italy ... that I know for certain.