Nested Archs

partcount-total-4 size-7s-1s-4b

Brick Arch 1 x 3 x 2 Curved Top Brick Arch 1 x 5 x 4 Brick Arch 1 x 6 x 3 1/3 Curved Top Brick Curved 1 x 2 x 1 1/3 with Curved Top

Why?

Rylie Howerter ( 2012-04-17, flickr.com )

For a discussion in the LEGO flickr group.