Porn test
The explanation is useless, unless you already have an understanding. Making the explanation itself pointless while at the same time making the effort or the attempt of the explanation what is important. The effort of making the explanation can not exist without the explanation. The importance is found only in the act of the unimportant.
Starting to think 21M may not have been an arbitrary number... And if that's the case 10 minutes may have also been deliberate