STRICT TECHNICAL TEXTURE FILL. Exact 256x256 transparent...

STRICT TECHNICAL TEXTURE FILL. Exact 256x256 transparent canvas. 4 columns 4 rows of 64x64 cells. In EACH cell a different gray 32x32 wall-connectivity silhouette is centered at offset16,16, surrounded by transparent gutters. Color ONLY existing gray pixels, preserve EXACT alpha silhouette pixel for pixel. DO NOT move, reshape, rotate, extend, shorten or join any guide shape. Each existing straight arm must end exactly at same coordinate as guide. Low top-down cutaway Beijing courtyard wall, NOT frontal pillars, no roofs, no tall elevation, no labels. All lighting fixed upper left. Fill each strip with muted blue gray brick TOP SURFACE, tiny brick joints and subtle short south edge.Add visible cracks and chips INSIDE each existing strip, half damaged, but do not break connections or alter any alpha edge.