▁sees . ▁It ▁is ▁his ▁world , ▁which ▁he ▁dep ict s ▁in ▁his ▁own ▁characteristic ▁manner , ▁in ▁which ▁the ▁trans par ency ▁of ▁materials ▁plays ▁a ▁major ▁role . ▁ ▁He ▁created ▁the ▁sculpt ures ▁" Jo y ▁of ▁Life " ▁and ▁" O l ter d issen ' s ▁Work " ▁at ▁the ▁G rote ▁L oo iers stra at ▁in ▁Ma astr icht . ▁His ▁works ▁compr ise ▁oil ▁paint ings , ▁g ou aches , ▁temper as , ▁draw ings , ▁book ▁illustr ations ▁( for ▁example ▁for ▁a ▁dictionary ▁of ▁the ▁Ma astr icht ▁dialect ▁and ▁a ▁book ▁about ▁the ▁liber ation ▁of ▁Le iden ), ▁glass ▁windows ▁for ▁churches ▁in ▁U tre cht ▁and ▁B rab ant , ▁fres cos ▁( Ma astr icht ), ▁s gra ff itos ▁( C uy ck , ▁Brun ss um ), ▁port ra its ▁and ▁sculpt ures . ▁He ▁was ▁also ▁an ▁art ▁critic ▁for ▁a ▁regional ▁newspaper ▁and ▁for ▁fifteen ▁years ▁he ▁taught ▁" c ult ural ▁life " ▁at ▁the ▁teachers ▁training ▁college ▁of ▁Veg hel . ▁ ▁His ▁works ▁have ▁been ▁exhib ited ▁in ▁Ma astr icht , ▁Sch even ingen , ▁Amsterdam , ▁Bonn , ▁Paris , ▁Rome , ▁Barcelona ▁and ▁Tokyo , ▁among ▁others . ▁ ▁Bibli ography ▁▁ ▁Voll mer ▁II , ▁All geme ines ▁Lex icon ▁der ▁bild enden ▁Künstler ▁des ▁XX ▁Jahrhundert , ▁( General ▁lex icon ▁of ▁visual ▁artists ▁of ▁the ▁ 2 0 th ▁century ), ▁in ▁German ,