I'm not convinced by the marble trick - sounds like a dubious story I heard on a Management (
) course about life/work balance.
Rock = major parts of your life -health family work
Pebble = important things - holidays friends etc
sand = not so important things but they have to be done anyway - car maintainance bills roof repairs etc.
Pint glass = your life
The story goes that if you put all your rocks in first, the glass is full.
No. There is still space to cram the pebbles in around the rocks. Life full?
Still no. Feed the sand around the rocks and pebbles and then your life is full.
Rubbish - you can still pour some whisky into the glass without it overflowing
Morale of the story: no matter how full your life is, there is always room for a whisky.