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Author Topic: For those of you who enjoy optical illusions  (Read 2687 times)

broadstairs

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For those of you who enjoy optical illusions
« on: July 03, 2016, 09:34:49 AM »

Just take a look at https://youtu.be/oWfFco7K9v8 and enjoy....

Stuart
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Black Sheep

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Re: For those of you who enjoy optical illusions
« Reply #1 on: July 03, 2016, 09:51:18 AM »

Clever stuff.
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burakkucat

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Re: For those of you who enjoy optical illusions
« Reply #2 on: July 03, 2016, 01:21:31 PM »

Very interesting.  :)

I wasn't completely sure of the exact shape of the object(s) but had a feeling for what they would be.
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kitz

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Re: For those of you who enjoy optical illusions
« Reply #3 on: July 09, 2016, 09:38:30 PM »

No....   My brain is trying to compute that... and failed.  :D
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NewtronStar

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Re: For those of you who enjoy optical illusions
« Reply #4 on: July 16, 2016, 01:00:35 AM »

Here is my illusion 40/10 to 80/20 amazing what you can do with a slight of hand on a text editor now that's magic  ;D


Mode   VDSL2
Traffic Type   PTM
Status   Up
Link Power State   L0
Downstream   Upstream
Line Coding (Trellis)   On   On
SNR Margin (dB)   6.3   6.1
Attenuation (dB)   25.1   0.0
Output Power (dBm)   11.2   3.2
Attainable Rate (Kbps)   138554   26511
Rate                (Kbps) 79989           19998
B (# of bytes in Mux Data Frame)   227   191
M (# of Mux Data Frames in an RS codeword)   1   1
T (# of Mux Data Frames in an OH sub-frame)   0   42
R (# of redundancy bytes in the RS codeword)   10   8
S (# of data symbols over which the RS code word spans)   0.1903   0.9362
L (# of bits transmitted in each data symbol)   10003   1709
D (interleaver depth)   8   4
I (interleaver block size in bytes)   238   100
N (RS codeword size)   138   105
Delay (msec)   0   0
INP (DMT symbol)   51.00   48.00
OH Frames   0   0
OH Frame Errors   1069   192
RS Words                           36     29
RS Correctable Errors           858   242
RS Uncorrectable Errors   0   0
HEC Errors   0   0
OCD Errors   0   0
LCD Errors   0   0
Total Cells   418   0
Data Cells   149   0
Bit Errors   0   0
Total ES   0   0
Total SES   0   0
Total UAS   0   0

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kitzuser87430

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kitz

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Re: For those of you who enjoy optical illusions
« Reply #6 on: July 31, 2016, 11:29:22 PM »

Brilliant.   So much hard work has gone into making those shapes and getting the angles right. 
Well at least we know that it was real even though it only works with specific lighting and angles.  It would have been so much easier to do it digitally.  :D
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broadstairs

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Re: For those of you who enjoy optical illusions
« Reply #7 on: August 01, 2016, 08:03:48 AM »

Yes I wondered if someone would post the how to do it version.... I suppose in some ways it was done digitally in that a 3-D printer was used  ;)

Stuart
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burakkucat

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Re: For those of you who enjoy optical illusions
« Reply #8 on: August 01, 2016, 02:26:48 PM »

I wonder how a basic 3D-printer will cope with, say, Penrose stairs, the Penrose triangle or a Möbius strip:D

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roseway

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Re: For those of you who enjoy optical illusions
« Reply #9 on: August 01, 2016, 02:59:21 PM »

It would be fun to try :)

On reflection, the Penrose stairs can be made very easily. All you have to do is slope each step down towards the back so that overall the stairs don't rise at all.
« Last Edit: August 01, 2016, 03:03:01 PM by roseway »
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sevenlayermuddle

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Re: For those of you who enjoy optical illusions
« Reply #10 on: August 01, 2016, 04:03:58 PM »

Here's one of my favourites. 

Watch this one first...

https://m.youtube.com/watch?v=l01eiXpM_20

Then this one shows how it's done.

https://m.youtube.com/watch?v=plQFXts2qlk

I actually made a copy out of some old timber.  Nowhere near as good as the original, and propped up on long pegs rather than ropes, but it was suprisingly effective for just a couple of hours' work.   Pity I can't find my own photos.   :)
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sevenlayermuddle

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Re: For those of you who enjoy optical illusions
« Reply #11 on: August 01, 2016, 04:17:11 PM »

I wonder how a basic 3D-printer will cope with, say, Penrose stairs, the Penrose triangle or a Möbius strip:D



I can't see a problem printing Penrose stairs. 

I'm pretty sure Möbius strips should be printable too, after all they can be made out of cardboard, with a little glue.  Or am I missing something?

Impossible triangles... I'd say No.   They do 'exist' and are on display in various places, but all depend upon a perfect viewpoint to create the illusion, as per the impossible crate I posted.

Happy, as always, to be proven wrong.   In fact this time, happier than ever to be proven wrong, these things do fascinate me. :D
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gogeta

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Re: For those of you who enjoy optical illusions
« Reply #12 on: August 19, 2016, 03:26:01 PM »

Love a good optical illusion, I remember loving magic eye books when i was young
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