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 47% AustraliaAustralia7192AsiaAsia686AfricaAfrica7631North AmericaNorth America413continents riddles » Which continent is that?Australia. This is Australia map, with north at the bottom side.Created by: globalquiz.orgeasy 71% North AmericaNorth America2300South AmericaSouth America791AsiaAsia3238AustraliaAustralia15946illusions 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 87% 10%10%24525%25%44750%50%1125NoneNone12367technology 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 left381the one on the rightthe one on the right1599both are the same sizeboth are the same size16721the first one you look atthe first one you look at502technology 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 Basinger484MadonnaMadonna1311Marylin MonroeMarylin Monroe13490Woody AllenWoody Allen2139technology 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% squaresquare20354rhomboidrhomboid2903concave squareconcave square2354concave rhomboidconcave rhomboid1622geometry 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 62% AA802BB4975None of themNone of them15692Both are largerBoth are larger3634mathematics 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 85% AA537BB1563CC306All are the sameAll are the same14769technology 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 46% red onered one4432blue oneblue one2068none of themnone of them1776both of themboth of them1176technology 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 only726green and red onlygreen and red only1365green, blue and redgreen, blue and red10437nonenone2458technology riddles » Play technology quiz and see all the questions.