Nevertheless, Takemitsu incorporated some idiomatic elements of Japanese music in his very earliest works, perhaps unconsciously. One unpublished set of pieces, "Kakehi" ("Conduit"), written at the age of 17, incorporates the "ryō", "ritsu" and "insen" scales throughout. When Takemitsu discovered that these "nationalist" elements had somehow found their way into his music, he was so alarmed that he later destroyed the works. Further examples can be seen for example in the quarter-tone glissandi of "Masques I" (for two flutes, 1959), which mirror the characteristic pitch bends of the "shakuhachi", and for which he devised his own unique notation: a held note is tied to an enharmonic spelling of the same pitch class, with a portamento direction across the tie.