Abstract: A construction device comprises a panel which may be used for a structural member in either an interior or exterior wall and which has a side with a transparent wall. The transparent wall forms an exposed exterior surface. A chamber is defined behind the exterior surface either directly adjacent it or spaced therefrom. A fluid is positioned in the space and is selected for the characteristic that is to be imparted to the space, for example it may be of a particular color, insulation characteristic, heat transfer characteristic, reflection characteristic, light absorption characteristic, strength characteristic, shielding characteristic either in respect to magnetic, electronic or heat conditions, etc. The arrangement is such that when the fluid is behind the transparent wall it permits the wall to be used for example as a solar panel or as a transparent window panel if desired.