. ▁That ▁is , ▁if ▁asked ▁which ▁was ▁the ▁cube ▁and ▁which ▁was ▁the ▁sphere , ▁he ▁would ▁not ▁be ▁able ▁to ▁do ▁so , ▁or ▁even ▁guess . ▁ ▁The ▁question ▁was ▁originally ▁pos ed ▁to ▁him ▁by ▁phil os opher ▁William ▁Mol y ne ux , ▁whose ▁wife ▁was ▁blind : ▁Suppose ▁a ▁man ▁born ▁blind , ▁and ▁now ▁adult , ▁and ▁taught ▁by ▁his ▁touch ▁to ▁distinguish ▁between ▁a ▁cube ▁and ▁a ▁sphere ▁of ▁the ▁same ▁metal , ▁and ▁n igh ly ▁of ▁the ▁same ▁b ign ess , ▁so ▁as ▁to ▁tell , ▁when ▁he ▁felt ▁one ▁and ▁the ▁other , ▁which ▁is ▁the ▁cube , ▁which ▁is ▁the ▁sphere . ▁Suppose ▁then ▁the ▁cube ▁and ▁the ▁sphere ▁placed ▁on ▁a ▁table , ▁and ▁the ▁blind ▁man ▁made ▁to ▁see : ▁query , ▁Whether ▁by ▁his ▁sight , ▁before ▁he ▁touched ▁them , ▁he ▁could ▁now ▁distinguish ▁and ▁tell ▁which ▁is ▁the ▁glo be , ▁which ▁the ▁cube ? ▁To ▁which ▁the ▁ac ute ▁and ▁jud icious ▁propos er ▁answers : ▁' Not . ▁For ▁though ▁he ▁has ▁obtained ▁the ▁experience ▁of ▁how ▁a ▁glo be , ▁and ▁how ▁a ▁cube , ▁affect s ▁his ▁touch ; ▁yet ▁he ▁has ▁not ▁yet ▁att ained ▁the ▁experience , ▁that ▁what ▁affect s ▁his ▁touch ▁so ▁or ▁so , ▁must ▁affect ▁his ▁sight ▁so ▁or ▁so ... ' ▁ ▁In ▁ 1 7 0 9 , ▁in ▁A ▁New ▁Theory ▁of ▁V ision , ▁George ▁Ber keley ▁also ▁concluded ▁that ▁there