An outstanding user of walls for buildings is Kevin Roche, and for spatial aspects, not only wall based, his Ford Foundation is a must in XX century architecture. And well, yo could go even as early as to expressionism to find very interesting curved walls put to use, as by Poelzig, and sure if you investigate the twenties in Pays Bas some of the painters cubism passed there to flat faced wall architecture, later through glass, international one. Browse one illustrated book of XX century architecture, and choose, that's my final advice on this.
Life is some conflict.