If you can, sit at a south facing window for natural light, you can also buy a flexible wire rimmed light diffuser used for photography. If you can get the righ

If you can, sit at a south facing window for natural light, you can also buy a flexible wire rimmed light diffuser used for photography. If you can get the right diffuser for your window frame it should flex into the frame and stay in place (unless the window is open and it cat he's the wind!)