Ice Cream

On Page Fifty-Six Sayadaw goes further to discuss not only Jhana but the mastery of Jhana.  There are, he says five masteries:

1. To enter jhana whenever desired. 
2. To resolve to stay in jhana for a determined duration
3. To emerge from jhana at a determined time
4. To advert to the jhana factors
5. To review the jhana factors

He also discusses mastery of the stages of jhana, and reflection on the dissatisfaction of each a one progresses.

It makes sense to me, the way concentration leads to such a peaceful place, and yet retains the qualities of the three marks in some subtle way.  And to master coming out of jhana, must be exactly like letting go of the taste of something sweet.