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This would be great to bring light into the main floor ... Floor on one side, ceiling on other. std ssize 3-4 inches thick with a hollow vacuum center or as a solid piece of glass that is as thick as 3 inches with no hollow center.
Pavement Lights
Glass Block Roof Lights
glass block paving
B 1111/6 CLEARVIEW SAHARA 1S - Glass paver by SEVES GLASSBLOCK | ArchiExpo
Glass paver / high performance and load / made from recycled materials - TECHNOLOGY : BG 1414/11 CIRCLES - SEVES GLASSBLOCK