What's a jig-jog brick wall?
The mage pointed to a two-story house of brick and timber behind a jig-jog brick wall with deep arches.
Wouldn't be possible to understand as jig-jog what in Architecture is known as "articulated"__An articulated wall, which I think is when bricks are in and out in a decorative way all along its surface.
I add the characteristics of the neighbourhood in which the house and the wall are:
the snobby neighborhood sported houses gaudy even by the citizens' standards. Mismatched towers, archways, curved staircases, hedged gardens, turrets, tricolor chimneys, false fronts, frescoes, balconies, and other ridiculous trappings decorated the block.