Something a bit unusual for you this morning, take a look at 'La Trufa', or the 'The Truffle'.

Intended as a weekend retreat, the rock-like structure is perched on the Costa da Morte in north-west Spain and was designed and built by Spanish architects Ensamble Studio - assisted by a calf called Paulina...

The space has been crafted within a large stone that sits on the ground and is almost entirely camouflaged since it emulates the processes of mineral formation in its structure, and integrates with the natural environment.

"To build it, we made a hole in the ground, piling up on its perimeter the topsoil removed, and we obtained a retaining dike without mechanical consistency." say the studio.

"Then, we materialized the air, building a volume with hay bales and flooded the space between the earth and the built air to solidify it. The poured mass concrete wrapped the air and protected itself with the ground. Time passed and we removed the earth discovering an amorphous mass."

But so far, Ensamble had not quite created architecture, instead, fabricating a stone.

"We made a few cuts using quarry machinery to explore its core and discovered its mass inside built with hay, now compressed by the hydrostatic pressure exerted by concrete on the flimsy vegetable structure."

To empty the interior, they called in a calf called Paulina, who ate 50m3 of the nicest food.

It took her a year, and she left as an adult weighing 300 kilos; having created the perfect weekend retreat.