We study systematically the topography behavior of PHEMA-b-PMMA block as a function of the PHEMAand PMMA block lengths after selectively collapsing the top (PMMA) block by using surface-anchoredassemblies of poly(2-hydroxyethyl methacrylate-b-methyl methacrylate), PHEMA-b-PMMA, block copolymerwith orthogonally varying lengths of each block. Our experimental results are in excellent qualitativeagreement with topology diagrams predicted by self-consistent field calculations of Zhulina and co-workers.