Dyckia dussenii - olive form

Plants are capable of strategies you would not believe.
Nature does not waste energy doing a meaningless structure. Every detail has a reason to exist.
Everything has a reason and a good one. Those Dyckias, in case Dyckia dussenii has a reason to have silvery leaf undersides:
Protection from the scorching sun during dry times.
But this should happen on the leavers and not under, ok?
No! The plant when stressed by dehydration lifts the leaves up, so facing the sun with the silvery undersides of the leaves and making a shield for the growing area of the plant.
Plant behaviour?
Yes!!!!!!