That's like lego he's standing next to. That's easy peasy! I was a dyker for years and you worked with what you had, in Fife it was whin (the worst after riveer cobbles), Dundee it was greenstone, Endrick it was sandstone if you were lucky, and generally field rubble for all the rest. Masters ticket, what a load of cack. It means nothing. Building a dyke from any material means everything and thats what most farmers did. Anyone can build a dyke with lego stone, but building with field rubble requirres skill, patience and a lot of know how!
Incidently it was often napoleonic prisoners of war who did dykes up here in Scotland.