Monday, 11 July 2011

Back to Jerusalem

Back to Friday's trip around Jerusalem.

Below is the Wailing Wall, where more magic occurs, but this time of the Jewish variety. Messages on scraps of paper are pushed into the cracks in the wall and God somehow reads them. Seems a bit pointless if you are able to merely pray.

Here we have the Garden of Gethsemane at the foot of the Mount of Olives, where a bloke will sell you what are meant to be tiny sprigs of the olive trees there. If the sprigs were indeed from the (quite small) Garden of Gethsemane, then given the number of visitors, the place would be stripped bare in a month. This particular olive tree is said to date from the time of Jesus, which is eminently possible given the great age to which olive trees can grow.

As for people's belief in magic - experiments with humans have demonstrated time-after-time that, providing enough emotional investment has been expended in its pursuit, there is nothing a human is not prepared to believe.

An observation from the coach; you know those black dots that are used on glass to prevent the glare of the sun coming through? Well, the black absorbs the sun's energy and re-radiates it into you car, coach, or whatever. Why don't they use white dots so as to reflect both the heat and the light? I'm sure some physicist can illuminate me.


  1. Magic is also more believable when it costs a lot. Like magic knickers for example.

  2. How strange, I thought the Wailing Wall was in Wapping. You learn something every day when you read TTOCB

  3. MS: And magic markers.

    Alan: You're confusing it with the Graffiti Wall.

  4. White dots make the windows look more opaque, milky, from the outside - for many reasons, possibly just aesthetic, this is to be avoided. They will also reflect more internal light onto the occupants, making the internal space feel more confined, and interfere more with your view of the outside world.

  5. Ken: But if the white dots allow less light into the cockpit in the first place (and they must, as they obscure the incoming light), there will be less light - full-stop, which is the desire effect?

  6. Chortle ;) Chairman, they don't allow less light in:tThe photons that fall on the black dots are stopped too, they're just not reflected back as much. They're absorbed and redistributed as heat, but not just back into the vehicle - through the glass which is radiating back into atmosphere for the most part. Net difference of energy dissipation black v. white is very small. The colour of the dots doesn't matter - the same amount of light is let in, it's just we're more attuned to noticing the white ones against the outside backdrop - that's a perceptual optical effect only.