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.orgcontinents riddles »hard 47% AustraliaAustralia5826AsiaAsia564AfricaAfrica6095North AmericaNorth America332 Which continent is that?Australia. This is Australia map, with north at the bottom side.Created by: globalquiz.orgillusions riddles »easy 70% North AmericaNorth America1905South AmericaSouth America648AsiaAsia2568AustraliaAustralia12448 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 Lambertytechnology riddles »very easy 86% 10%10%20625%25%38350%50%987NoneNone10287 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.orgtechnology riddles »very easy 86% the one on the leftthe one on the left283the one on the rightthe one on the right1205both are the same sizeboth are the same size12091the first one you look atthe first one you look at401 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: Cleotechnology riddles »easy 77% Kim BasingerKim Basinger351MadonnaMadonna977Marylin MonroeMarylin Monroe10042Woody AllenWoody Allen1631 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 Foxgeometry riddles »easy 74% squaresquare15811rhomboidrhomboid2184concave squareconcave square1851concave rhomboidconcave rhomboid1250 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.orgmathematics riddles »average 61% AA676BB4105None of themNone of them11986Both are largerBoth are larger2817 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.orgtechnology riddles »very easy 85% AA389BB1255CC230All are the sameAll are the same11235 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.orgtechnology riddles »hard 46% red onered one3489blue oneblue one1681none of themnone of them1367both of themboth of them901 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.orgtechnology riddles »average 69% blue and red onlyblue and red only594green and red onlygreen and red only1094green, blue and redgreen, blue and red8183nonenone1873 Play technology quiz and see all the questions.