Conversation so far:
what was Jikken Kobo?
Tōru Takemitsu was a founding member of the anti-academic Jikken Kōbō: an artistic group who sought to avoid Japanese artistic tradition.
what kind of projects did the Jikken Kobo produce?
Jikken Kobo produced multidisciplinary collaboration on mixed-media projects
what else did Tōru Takemitsu produce besides multidisciplinary collaboration on mixed-media projects?
During this period Tōru Takemitsu wrote Saegirarenai Kyūsoku I; and by 1955 Takemitsu had begun to use electronic tape-recording techniques in such works as Relief Statique and Vocalism A·I.
was Tōru Takemitsu working on his own or did he get help from others?
Tōru Takemitsu also studied in the early 1950s with the composer Fumio Hayasaka, perhaps best known for the scores he wrote for films by Kenji Mizoguchi and Akira Kurosawa
What films did Tōru Takemitsu write music for?
Tōru Takemitsu's contribution to film music was considerable; in under 40 years he composed music for over 100 films, some of which were written for purely financial reasons.
did Tōru Takemitsu get any awards for his music?
Tōru Takemitsu won awards for composition, both in Japan and abroad, including the Prix Italia for his orchestral work Tableau noir in 1958, the Otaka Prize in 1976 and 1981
what genre of music did Tōru Takemitsu's productions have?
electronic music technology, or in Tōru Takemitsu's own words, to bring noise into tempered musical tones inside a busy small tube

Question: what year did the early development start?
Self-contained rewrite: what year did the early development of Tōru Takemitsu's music start?