Apologies if you were hoping to avoid a Star Wars related post but there is a tenuous link to castles and towers, I promise. TBB regular Simply Bricking It, has built our favourite Star Wars droid, R2-D2.
The builder uses a mix of round and regular parts to allow a slight offset position, resulting in the curved shape. The use of alternate round and regular bricks is a technique that has been used frequently in the past for curved ‘tower’ structures (eg. castles, windmills, lighthouses and even spaceships). But I believe this is the first droid I have seen built using this particular technique.
I can’t finish this post without mentioning the vintage tap parts used for R2D2’s leg detailing — a ‘splash’ of inspiration there.