“Every day that he writes jokes he crosses out the date on the calendar with a big red X. “After a few days you’ll have a chain,” Seinfeld said. “Just keep at it and the chain will grow longer every day. You’ll like seeing that chain, especially when you get a few weeks under your belt. Your only job next is to not break the chain.” This chain method (as some now call it) soon became a hit among writers and fitness enthusiasts—communities that thrive on the ability to do hard things consistently. For our purposes, it provides a specific example of a general approach to integrating depth into your life: the rhythmic philosophy. This philosophy argues that the easiest way to consistently start deep work sessions is to transform them into a simple regular habit. The goal, in other words, is to generate a rhythm for this work that removes the need for you to invest energy in deciding if and when you’re going to go deep. The chain method is a good example of the rhythmic philosophy of deep work scheduling because it combines a simple scheduling heuristic (do the work every day), with an easy way to remind yourself to do the work: the big red Xs on the calendar.”