Graphics3D[{
SurfaceColor[RGBColor[0,.7,.8]],
Cuboid[{23,-17,37},{35,-5,49}],
SurfaceColor[RGBColor[0,.7,.8]],
Cuboid[{37,-35,5},{49,-23,17}],
SurfaceColor[RGBColor[0,.7,.8]],
Cuboid[{5,-49,23},{17,-37,35}],
},
  AmbientLight -> GrayLevel[0.7],
  PlotRange -> {{-49, 49}, {-49, 49}, {-49, 49}}
  ]
  