Optical illusions can be defined as this: An experience of seeming to see something that does not exist or that is other than it appears, or something that deceives the eye by appearing to be other than it is.
Swilo leswi hinkwaswo swi nga ha va swi fambisana ni leswi valavisisi va swi vulaka leswaku i muxaka wo karhi wa ku va bofu - ku nga voni nchumu wo karhi, kumbe ku rivala nchumu wo karhi hikwalaho ko ringeta ku endla swilo swo tala hi nkarhi wun'we.