With this parentheses tool ( a javascript/HTML version ( made by Jan Maris, march 2010 ) of a program called haakjes, april 1994 written in Pascal for ms-dos by Gert Bontius ( after an idea of Jan Maris, while reading Nouvelles Impressions d'Afrique ( a book, so complex by the use of parentheses, that its writer ( Raymond Roussel ( born in 1877 and died ( under circumstances ( an overdose of drugs ) that don't exclude suicide ) in 1933 ) ) initially planned to print the different reading levels ( nine ) in different colors ) ) ) you can open the hidden ( and close the displayed ) text by clicking on the coloured curved brackets.