1. ## Barrel Riddle

Ok here's an interesting riddle, most of you 'elite' puzzle code crackers will find it easy but for those of us who havn't tried this before:
What can you put in a barrel that will:
Be seen by the naked eye
Make the barrel lighter in weight
And has no weight of it's own (I mean none, 0, so don't post helium balloon [img]/forums/images/smilies/wink.gif[/img] )

2. ## Re: Barrel Riddle

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">A hole</span hide> - does that make me an elite puzzle code cracker?

3. ## Re: Barrel Riddle

Well done - didn't expect such an fast answer but i knew it was going to come as it is fairly well known among riddlers [img]/forums/images/smilies/wink.gif[/img]. Excellent <img src=/S/shrug.gif border=0 alt=shrug width=39 height=15>

4. ## Re: Barrel Riddle

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">Holes, small ones, big ones and square ones too...</span hide>

5. ## Re: Barrel Riddle

Just being a PITA, but can a hole really be seen by the naked eye? You can see the absence of material, but you really cannot see the "hole", because a hole just describes the absence the material. <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

Steve

6. ## Re: Barrel Riddle

Just being a PITA on top of a PITA here <img src=/S/grin.gif border=0 alt=grin width=15 height=15> but it's the very absence of material (photons) that enables radio astronomers to "see" black holes.

Alan

7. ## Re: Barrel Riddle

But it still is a "deduction". It is not the same as "seeing" it. I can see an object fall and I can deduce and theorize about "gravity". But you can not see gravity, only its effect. I can remove wood from a barrel creating a hole, but I see the absence of the wood, I do not see a hole.

Steve

8. ## Re: Barrel Riddle

If you "see the absence of wood" then you do, by definition "see a hole".

StuartR

9. ## Re: Barrel Riddle

I once knew a man who sewed thousands of tiny holes together and made very nice butterfly nets!

10. ## Re: Barrel Riddle

"Seeing" is a complex perception which depends/ relies, at least in part, on a contrast between the photons reaching the eye - a contrast in wavelength as well as intensity. A part of such a contrast must surely include the complete absence of photons in some region of the field of view. On a simpler scale, it's still possible to "see" black on a colour palette... or see the black text on white paper.

Alan

11. ## Re: Barrel Riddle

Black ink is not truly "black" and does emit photons.

I remember hearing in school that the light reflected from the black ink outside on sunny day is more than the light reflected off the white page of the same book in a lit room.

Steve

12. ## Re: Barrel Riddle

WIthout the "context" if you took a picture of the hole, could you see it? I still say, you do not "see the hole". You see the absence, and you deduce the hole.

But, like I said, it is a PITA argument. On some level, we do not see anything, it is all deduction/interpretation by the brain <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

Steve

13. ## Re: Barrel Riddle

Steve

OK, I see your argument, but to see a hole you must have a border , therefore you are not actually seeing the hole but you are seeing the border.

Without border you do not have a hole but infinity. Therefore, you do not see the absence but you deduce absence. <img src=/S/dizzy.gif border=0 alt=dizzy width=15 height=15>

14. ## Re: Barrel Riddle

OK Steve, I can "see" we'll beg to differ on this forever. Looks like this hole issue will have to remain in the dark. I guess it's a grey area.

Alan

15. ## Re: Barrel Riddle

Its only the lounge that can make a whole discussion about a hole, a whole lot of fun! <img src=/S/laugh.gif border=0 alt=laugh width=15 height=15>

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