>>10642949 >sOmE PEOpLe fINd It DIFfICUlt to unDERStand hOW We Can See THE wORld PRoPeRLy WhEN the imaGe iS UPSIDe DoWn. ThE RigHt WAy TO tHiNK aBOUt ThIS Is to adOpt A compUTAtiONAl perspeCTiVE. We do NOT perCeive whaT Is oN ThE reTIna; INSTEaD, a PErcEpt Is fORmed ThrOUGh A CoMpLex Chain OF NeUraL cOMPutAtIoNs. A COnTRoL COMPUteR DOEs NOT CAre WhICH wAy iS uP, AND InvErsiOn oF the ImAgE is tHE lEASt oF tHe BrAiN'S CoMpUTatioNAL pRObLEms.