This is a Seinfieldian chain. The developers of Todoist got this idea from a productivity article about Jerry Seinfeld where he described that the key he used to getting better at writing and telling jokes every days was to get a giant calendar and mark off each day he wrote a better joke. Little by litte, bit by bit. See the square boxes, in Todoist you can click those off as you accomplish things. I created a task called “Run every other day” and then for the date I typed “every other day”. Todoists created boxes for every other day! What smart elegant software.