MUST?

       Must be careful.  "They" claim some biggish number (70?) different shapes are possible.  I don't intend to try them all by any means - but - it's not inconceivable that the odd one will appear.
      Like today, for instance.  Anybody who follows Jerra will know that today he left his Camera at home.  Consequently he didn't prowl the garden - SO - neither did I and it wasn't until he'd departed I realised that both I was Blipless AND it was dark.