How I've always viewed that question...

[acroyear]

"The optimist sees the half-full glass. The pessimist sees the glass half-empty. Better to see the glass as it is, both half-full & half-empty, without judgement." -- Robert Fripp, 10/23/03

Comments

[dglenn.livejournal.com]

Similarly, the sound engineer says the glass has 12dB of headroom. (More than it needs right at the moment, but it might not actually be wasted space if more water is coming in later.)