background preloader

Optical Illusions and Visual Phenomena

Optical Illusions and Visual Phenomena
Op­ti­cal il­lu­sion are fas­ci­nat­ing while teach­ing us about our vi­sual per­cep­tion, and lim­its thereof. My em­pha­sis here is on the beauty of per­cep­tual phe­nom­ena, on in­ter­ac­tive ex­per­i­ments, and ex­pla­na­tion of the vi­sual mech­a­nisms in­volved – to the de­gree that they are un­der­stood Be­friend­ing mo­bile de­vices: >50 in­ter­ac­tive demos now with­out Flash, but re­quire up-to-date browser ver­sions. Don’t let it irk you if you don’t see all the phe­nom­ena de­scribed. For many il­lu­sions, there is a per­cent­age of peo­ple with per­fectly nor­mal vi­sion who just don’t see it, often for rea­sons cur­rently un­known. If you are not a vi­sion sci­en­tist, you might find my ex­pla­na­tion at­tempts too high­brow.

Related:  Optical Illusions*

Impossible Triangle - The Illusions Index The Impossible Triangle (also known as the Penrose Triangle or the Impossible Tribar) was first created by Oscar Reutersvärd (1915 - 2002), a Swedish graphic artist known as the ‘father of the impossible figure’. It is anecdotally, but widely reported that he created it in 1934, aged 18 while doodling as a student in his Latin class. The illusion was independently discovered later and popularised by Lionel Sharples Penrose (1898 -1972), a British psychiatrist, geneticist, and mathematician, and his son Sir Roger Penrose (1931 -), a British mathematician, physicist and philosopher of science. Penrose and Penrose published the illusion in the British Journal of Psychology in 1958.

Dalai Lama tells his Facebook friends that religion "is no longer adequate" Well, he'd hardly be the first Buddhist to say something like this. From what I've read, there are already lots of Buddhists, and historical Buddhist movements in various countries, who are atheistic and who prefer to return to Buddhism's roots as a kind of self-help, personal psychological and philosophical system—and yes, I realize I'm hugely oversimplifying that ideological stripe of Buddhism—and that's fine. And if this helps the world be a better place, cool. I'm all for it. But as an atheist I had already got to this point without making sand paintings, spinning prayer wheels or staring at stupas or rock gardens to shut off all mental processes and get to Satori.

Chaîne de ScienceMagazine Science & Reason on Facebook: Star Size Comparison: The biggest/largest known stars in the Universe. ---Please subscribe to Science & Reason:• VY Canis Majoris (VY CMa) is a red hypergiant star located in the constellation Canis Major. Top 10 Most Peculiar Places in the World Top 10 Most Peculiar Places in the World Published on 2/1/2006 Thank you for Fucking, Austria Fucking is a small settlement (population c. 150) in Austria. The village is known to have existed as "Fucking" since at least 1070. The settlement's most famous feature is a traffic sign with its name on it beside which English-speaking tourists often stop to have their photograph taken. The sign is the most commonly stolen street sign in Austria.

An International Analysis of Web-based Education and Strategic Recommendations for Future Development of Online Education This paper presents an abstract of the 150 pages report: An International Analysis of Web-based Education and Strategic Recommendations for Future Development of Online Education . The report discusses global, institutional, and administrative issues of importance to online education. It further reports on advertising and financial issue, it analyzes pedagogical issues along with accreditation, assessment, enrollment, and progress flexibility. Future development and barriers to online education are discussed. Ebbinghaus Illusion - The Illusions Index Crane, T., and French, C., 2016. The Problem of Perception. In: Zalta, E. N., ed. The Stanford Encyclopedia of Philosophy. Responsible thinking web sites Critical Thinking sites: These sites discuss critical thinking and common errors in reasoning. The Critical Thinking Community While perhaps the most widely referenced site on critical thinking, the style of the above site is far too dry and academic for my taste.

Kowloon Walled City History[edit] Military outpost[edit] Lung Tsun Stone Bridge and Lung Tsun Pavilion (Pavilion for Greeting Officials) of Kowloon Walled City in 1898. The history of the Walled City can be traced back to the Song Dynasty (960–1279), when an outpost was set up to manage the trade of salt. Little took place for hundreds of years afterward, although 30 guards were stationed there in 1668.[1] A small coastal fort was established around 1810.[2] In 1842, during Qing Emperor Daoguang's reign, Hong Kong Island was ceded to Britain by the Treaty of Nanjing. Geek Overcomes Social Anxiety By Turning Life into RPG Gainesville, FL - Area geek Ross Davis has learned to overcome his long-standing social anxiety by turning his life into a Role-Playing Game (RPG). RPG systems such as D&D and GURPS have been part of the geek culture for decades, but they have traditionally served to further cement their participants into Loserdom. With the advent of computerized RPGs such as Neverwinter Nights and the Final Fantasy series, geeks have been able to further socially isolate themselves. Davis claims that his revolutionary application of RPGs can increase a geek's social skill by several levels and result in the accomplishment of new social feats.

NLII Mapping the Learning Space: Teaching Practices for Higher Education A multitude of factors have come together in rapid progression to change the way higher education approaches the classroom, teaching and learning. No better background on these changes can be found than in the Association of American Colleges and Universities' (AAC&U) panel report Great Expectations: A New Vision for Learning as a Nation Goes to College. Technology is rapidly changing what we call a course. Optical Illusions, Videos, Images, Brain Teasers and more! Good Morning and Happy Monday to everyone! Hope the weekend was good and you had a Happy Father’s Day! Today’s optical illusion is remarkable one because it is going to force anyone that sees it to really look at it and use their imagination! So, what do you all see because you are supposed to see a Native American sitting on a horse right next to his village, and there is a beautiful rainbow overhead, which really adds something to the picture. However, that is not all that people are going to see, and their eyes and brain are immediately going to take this picture and start seeing other things in it.

The Unintended Consequences of Transparency Before I get started I want to thank everyone for all the comments on last week’s post, Reconsidering Gift Economies. I will return to that topic next week with some revised thinking. This week I want to shift topics, inspired by an interview with election expert David Brady, via Russ Roberts of EconTalk, which suggests some curious conclusions regarding the benefits of transparency. The part that captured my attention was a discussion of what Brady calls ‘the personal vote‘. He is referring to the trend, beginning in the mid 1960s of congressional candidates running more on the basis of their personal characteristics and relying less on their party affiliation. It is important to be clear, he isn’t arguing that candidates became less partisan…only that candidates increasingly positioned themselves as individuals with unique platforms rather than as ‘the Party X candidate’.

Related:  Papers`test 1018