Aside from brick conservation as others noted, these walls can be used for growing fruit (https://www.lowtechmagazine.com/2015/12/fruit-walls-urban-farming.html

Aside from brick conservation as others noted, these walls can be used for growing fruit (https://www.lowtechmagazine.com/2015/12/fruit-walls-urban-farming.html https://www.lowtechmagazine.com/2015/12/fruit-walls-urban-fa... -- look for 'Serpentine Fruit Wall') though perhaps here it was purely for construction/aesthetics