Art object 'Inside Out', unknown artist

Intriguing object in stone and wire 'Inside Out': reinforced concrete or reinforced steel? Mind boggling object. We leave it to the spectator's imagination...
 
Bought in the '80s at an art gallery in Groningen, the Netherlands. So probably created by a Dutch artist. Unfortunately the exact information has got lost in time.
 
In excellent condition. Very nice details and well proportioned.
 
Depth: 35cm
Width: 35cm
Height: 35cm
Weight: about 20kg