Diffusive glass - this is what it looks like

Diffusive glass will scatter the direct radiation into a radiation that comes from several different directions. Compare it with a shower where the water comes in parallell in a new and clean disc, but is scattered in different directions when the shower has been used of a while. Diffusive radiation occurs during cloudy days and direct radiation occurs during clear days.

This video shows what it looks like.

Please read more here.

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