Optical illusions questions This is a list of recently added questions about optical illusions. Play optical illusions quiz and see all the questions. Which continent is that?Africa. This map of Africa is rotated so the continent shape resembles Australia.Created by: globalquiz.orghard 48% AustraliaAustralia7929AsiaAsia752AfricaAfrica8500North AmericaNorth America463continents riddles » Which continent is that?Australia. This is Australia map, with north at the bottom side.Created by: globalquiz.orgeasy 71% North AmericaNorth America2718South AmericaSouth America943AsiaAsia3819AustraliaAustralia18914illusions riddles » How many dots at the intersections are black?None. In this scintillating grid illusion, dark dots seem to appear and disappear randomly. Various theories have been proposed to explain it. It may be caused by the mechanism of lateral inhibition (the capacity of an excited neuron to reduce the activity of its neighbors).Created by: Steve Lambertyvery easy 88% 10%10%27225%25%50250%50%1247NoneNone14944technology riddles » Which orange circle is larger?Both are the same size. This is known Ebbinghaus illusion. Although commonly thought of as an illusion of size, recent work suggests that the critical factor in the illusion is not the size, but the distance of the surrounding circles. In a similar way, the Moon appears larger on clear sky when it's close to the horizon line.Created by: globalquiz.orgvery easy 87% the one on the leftthe one on the left468the one on the rightthe one on the right1965both are the same sizeboth are the same size21302the first one you look atthe first one you look at587technology riddles » Whose face has been combined with Albert Einstein in this hybrid image?Marylin Monroe. A Hybrid Image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. In order to see Marylin clearly, you need to move away of the screenCreated by: Cleoeasy 77% Kim BasingerKim Basinger603MadonnaMadonna1715Marylin MonroeMarylin Monroe17306Woody AllenWoody Allen2692technology riddles » How is this polygon called? (the one over the circles)Square. In this Ehrenstein illusion the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. But in reality, the sides are straight.Created by: Debbie Foxeasy 74% squaresquare24769rhomboidrhomboid3622concave squareconcave square2909concave rhomboidconcave rhomboid2038geometry riddles » Which shape is larger?None of them. Both shapes are the same, but the bottom one is placed more to the right. This is however difficult to notice. It is known as Jastrow Illusion.Created by: globalquiz.orgaverage 65% AA899BB5613None of themNone of them19980Both are largerBoth are larger4054mathematics riddles » Which line is the longest?All are the same. This illusion has a long research history. It seems that people living in urbanized areas perceive the lines as representing the corners of rectilinear objects viewed in perspective, being more susceptible to illusion than people from rural areas.Created by: globalquiz.orgvery easy 86% AA674BB1815CC366All are the sameAll are the same18225technology riddles » Which of the lines on the right, is the continuation of the black line on the left?Red one. This is known as Poggendorff illusion, first described in 1860. Many detailed studies of the illusion point to its principal cause: acute angles in the figure are seen by viewers as expanded.Created by: globalquiz.orghard 45% red onered one5251blue oneblue one2437none of themnone of them2301both of themboth of them1541technology riddles » Which lines are parallel?Green, blue and red. This is a well known Zöllner illusion, first described in 1860. It may be caused by this impression of depth. The black lines are parallel, too!Created by: globalquiz.orgaverage 69% blue and red onlyblue and red only833green and red onlygreen and red only1667green, blue and redgreen, blue and red13028nonenone3134technology riddles » Play technology quiz and see all the questions.