Thumbelina Sightings

Thumbelina

Kia: [Real-life Thumbelina?] Chos lang XD Bakit ang laki ng picture ko ang daya!!! Hahaha 

Is there really such a thing as a real-life Thumbelina? Or a minimized person that can fit into one's palm? Sorry to pop your bubble but they don't really exist. Reality isn't as magical as fairytales but thankfully, we can somehow escape from this objectivity through visual illusions. 

Visual illusions or more commonly known as optical illusions are a phenomena by which our visual system fabricates a three-dimensional interpretation of the world (Eagleman, 2001) based from the two-dimensional representation in our retina. Basically, it just means that our perception of the world does not tally with the actual size or depth or distance of these actual objects due to these illusions . We are also often fascinated by them since through visual illusions, we are effortlessly and easily challenged whether what we see is real (Bach & Poloschek, 2006).

Like in the picture above, we didn't actually find a pixie in school or invent a shrinking device, or even use CGI to create this effect (we can barely even use Photoshop). That's actually Sarj, one of the bloggers who went a couple of strides behind Kia and strategically posed to create this special effect. 

See? You can even see her shadow on the floor.

The perceived change in size of Sarj is due to her more distant position. Since she is farther from the observer's eye, she subtends a smaller visual angle than Kia, thus making her appear smaller. Well, visual angle is just the angle of an object relative to the observer's eye (Goldstein, 2010) or how the angle of the object of interest subtends at the eye.

Moreover, visual angle is influenced by the size of the stimulus and the distance of the object from the observer. The farther the object from the observer, the larger the visual angle it subtends, whereas when it is nearer, the visual angle is small.

Thumbelina: take 2

vs.

Thumbelina: take 3

Actually this trick has also been used by filmmakers such as Peter Jackson in the Lord of the Rings: The Fellowship of the Ring to accomplish interactions between normal sized humans and in the case of the LOTR, hobbits without the use of CGI. You can see how this was done (and other interesting non-CGI effects) in this article in Cracked. 

It basically uses the concept of forced perspective, wherein optical illusions are used to make an object appear different in distance and/or size than the actual reality (Bell, 2011).

Frodo and Gandalf are perceived to be sitting side-by-side

Frodo is actually sitting several feet away from Gandalf to make Frodo look smaller

Try it at home!

Close one eye and form the forefinger and thumb of the hand opposite the closed eye into a letter C (or a backward letter C). Try fitting a distant object between that space and then when you're sure, approach the object without moving your fingers and see which is bigger!

Who is taller?

Who do you think is taller of the two ladies standing there? The one on the left or the one on the right (imagine they're wearing the same shoes)?

Actually, they are both the same height! You've been deceived by what we call the Müller-Lyer Illusion. This happens when our visual system judges fins or angles that are "protruding out" to be longer, but those that are "protruding in" to be shorter (Goldstein, 2010). 

Muller-Lyer Illusion: Can you tell at first glance which one of the vertical lines is longer?

It is also interesting to note that perception of Muller-Lyer illusion is influenced by culture (Masuda, 2009). Westerners or individuals who grew up in a "carpented" world, perceive lines with protruding fins as longer, since they have been regularly exposed to corners of rectilinear objects. One the other hand, some cultures (e.g. hunters-gatherers) are said to be immune to the Muller-Lyer illusion, suggesting that perception is influenced by environment and previous knowledge.

Real-life application!

Are you the shortest among your friends? Fret not! The next time you take a group picture, put your hands up into a Y. You'll look like you're having the time of your life and you'll probably gain a few centimeters in height*. To make it even more effective, ask your friends to help you out by keeping their arms in an invered V position.

*Results are not guaranteed!

A thumb for a head

Is her head really smaller than a thumb? Or about as big as a thumbnail? I think you already know the answer to this. [Hint: Thumbelina] But, you might be wondering, why?

Let us take into account again the concept of visual angles. The hand is nearer to the observer, thus having a greater visual angle. It then makes it look bigger than the face.

Hand x 4

Which one of these hands is first in line to have a meaningful conversation with you?

We assume you could probably guess it's the one on the left most part. How did you know that though? What if those hands were actually connected to one another and were actually only just one big hand?

The thing is, our brains are capable of perceiving depth and distance according to a number of factors.

What you've done in this case is actually judge a distance according to shadows, relative size and deletion. Your brain probably registered the shadows which were cast along the hands and judged that those were cast by the hands which are in front of them. 

Parting words and a disclaimer in between

Being able to perceive visual illusion is a gift.. You might have taken it for granted before, but people with autism are not really susceptible to these illusions (Mitchell & Ropar, 2005). I guess you can be thankful to your properly processing visual system, but visual illusion perception does not come from this alone. Your previous experiences, environment, and knowledge play a role in enabling you to perceive these. Visual illusions actually look convincing only if you want them to (Ganel, Tanzer, & Goodale, 2008). So really, you can believe there exists a Thumbelina in this world. :)

A crash course on Photoshop, this was not.

What do you do when you're asked to take pictures demonstrating depth and size?

Whip out your cellphones and take pictures, silly!

And that's what we did.

References:

Bach, M., & Poloschek, C. (2006). Optical Illusions. Visual Neuroscience, 2(6), 20-21. Retrieved from http://www.acnr.co.uk/pdfs/volume6issue2/v6i2visual.pdf

Bell, D. (2011). 8 Movie Special Effects You Won't Believe Aren't CGI. Retrieved from  http://www.cracked.com/article_19140_8-movie-special-effects-you-wont-believe-arent-cgi.html

Eagleman, D. (2001). Visual Illusions and Neuorobiology. Nature Reviews, 2(1), 920-926. Retrieved from http://physiology.elte.hu/gyakorlat/cikkek/Visual%20illusions%20and%20neurobiology.pdf

Ganel, T., Tanzer, M., & Goodale, M. (2008) A Double Dissociation Between Action and Perception in the Context of Visual Illusions: Opposite Effects of Real and Illusory Size. Psychological Science, 19(3) , 221–225. Retrieved from Ebsco database.

Goldstein, E. (2010). Sensation and Perception 8th ed. Belmont, CA: Cengage Learning.

Masuda, T. (2009). Cultural effects on visual perception. Cultural Psychology, 339-343. Retrieved from http://www.ualberta.ca/~tmasuda/Masuda(2009).pdf

Mitchell, P. & Ropar, D. (2005). Visuo-spatial abilities in autism: a review. Infant and child development, 1-30. Retrieved from http://www.psychology.nottingham.ac.uk/staff/peter.mitchell/icd%20article.pdf

[Untitled image of Master Yoda]. (n.d.). Retrieved September 9, 2012 from http://images2.wikia.nocookie.net/__cb20111008200711/starwars/images/3/31/TPM-CGYoda.JPG