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so what do you do with your fish tank

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full of sugar water when you've finished

3
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your experiment well you make something

4
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sugar water this laser is bent because

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of the sugar gradient going down here

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denser at the bottom so it sends down so

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if I was to stick this in here and swirl

8
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it around we shouldn't Theory get thus

9
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the laser straightening out so let's see

10
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you

11
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laser is getting very distorted kind of

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like turbulence I'm looking at the sugar

13
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water it looks like hot air and a hot

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day like a bow of fire so faith mix it

15
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up and then let it sail down oops

16
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knocked over one of my pylons we should

17
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see that the laser becomes straight now

18
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it's bouncing around a bit because of

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the turbulent water there you can see

20
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it's becoming more diffuse simply

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because there's a bunch of crap in the

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waters now I may give it a good mix good

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hole all mixed up completely they're

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gonna let it settle down I also have my

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camera at the end my iPhone which is

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doing the kind of skyline view it's not

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over all of my mileage

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unfortunately so today we will be able

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to see something from inside all right

30
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once I've already knocked over I'm gonna

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and now you can see the laser is just

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essentially going in a straight line it

33
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is spreading out more because of all the

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crap in the water but it was bending

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straightline now

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you

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oh sure so the iPhone at the end of the

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tank did

39
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in footage on the left we see the view

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along the tank the ground has been

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raised up quite significantly so the the

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horizon the essential horizon as being

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flattened out and you can see if you

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look at the block on the left-hand side

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you can see over 18 you have to see the

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ground beyond it now if you look on the

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right-hand side the right-hand side

48
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image this is when the water has been

49
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mixed up and so there's no refraction

50
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and now you can see that the block on

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the left-hand side is now blocking the