"Brian Gaff" wrote:
Are they exact but larger replicas of the interlocking mechanism?

They ate concrete rather than plastic so the blocks don't clip. The do have
eight pips per block like Lego.

I wondered about the name because Lego threatened to sue the Uni department
that I worked at in the 80s because we described a block histogram as a
"Lego plot". I got a personal letter from their legal eagles and had to
send them a signed apology for abusing the Lego(tm) trademark.