Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE nomination ( artwork_id number, festival_id number, result text )
TABLE: CREATE TABLE festival_detail ( festival_id number, festival_name text, chair_name text, location text, year number, num_of_audience number )
TABLE: CREATE TABLE artwork ( artwork_id number, type text, name text )

### Question ###
Show distinct types of artworks that are nominated in festivals in 2007.

### Accurate SQL ###

SELECT DISTINCT T2.type FROM nomination AS T1 JOIN artwork AS T2 ON T1.artwork_id = T2.artwork_id JOIN festival_detail AS T3 ON T1.festival_id = T3.festival_id WHERE T3.year = 2007