No – I didn’t know what it meant either but it looks impressive.
This is one of Robert’s lockdown projects – clever eh?
Here’s a Cluedo box suspended in mid air by some strings?
Look carefully and you’ll see one small string in the centre between the two sloping rods. Could this be holding everything up? How?
Here’s a short video showing what happens when you rock it slightly.
See how it settles back down to its stable state.
If you like Wikipedia then there’s information on Tensegrity there – it would seem that even the human spine is in on the act.