Nobody spends six figures on a mechanical watch because it is the most efficient way to know the time. People buy fine watches for the same reason they buy art or classic cars. They are drawn to craftsmanship, beauty, engineering, rarity, history, and the emotional power of an object made by human hands.
The inspiration for the mechanical marble clock comes from Ivan Miranda, an engineer known for building enormous marble clocks at an almost architectural scale. The response project is quite the opposite, though, because the creator tries to see what the smallest, simplest, cheapest version of this idea could work.
Since every planet spins at a different speed, the gears are built with different ratios: Earth takes about 24 hours to spin once, Mars takes about 24.6 hours, Jupiter spins much faster, and Saturn spins fast too. Because of this, each dial shows the real day cycle of that planet, so the clock doesn't calculate time digitally.