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 table_20903658_1 ( medium VARCHAR, artist VARCHAR )

### Question ###
What medium was used for the sculpture by Ernest Richard Gause?

### Accurate SQL ###

SELECT medium FROM table_20903658_1 WHERE artist = "Ernest Richard Gause"