Wondering about those erratic boulders?

So after first seeing the promise of erratic boulders on an info board, their mystery slowly unravelled as I rode around the islands of Hiiumaa and Saarema. A closed farm museum had some panels explaining more about the different rocks found in the region, I learnt the Estonian word for rock – Kiki, so I could recognise it on the brown signs, of which there are many. And eventually, someone asked me if I had seen the rock one night when I was setting up camp. Which finally led me to an erratic boulder in the flesh.