Only Connect

... if you watch this TV puzzles game, hosted by Victoria Coren-Mitchell, you'll recognise the format. The question is: what might appear in the fourth square in this sequence?

One possible answer is my Extra today, as I celebrate ten years' blipping! I began on 18th November 2010 with a cloudscape - still a favourite subject. Blip has kept many of us going through thick and thin - joy and sorrow - and now it's helping us connect in these dire times of disease. Only Connect seemed the perfect theme for my blipday. Thanks to the clever and dedicated bods who keep this site going, and thank you to all visitors - you lovely lot!

Have you solved the puzzle? What might you have put in the last square?