Question: The director of "I'm Still Here" appeared as a child in what PBS tv movie?

Context paragraphs:
Casey Affleck: Caleb Casey McGuire Affleck-Boldt (born August 12, 1975) is an American actor and director.  He began his career as a child actor, appearing in the PBS television movie "Lemon Sky" (1988) and the ABC miniseries "The Kennedys of Massachusetts" (1990).  He later appeared in three Gus Van Sant films – "To Die For" (1995), "Good Will Hunting" (1997), and "Gerry" (2002) – and in Steven Soderbergh's comedy heist trilogy "Ocean's Eleven" (2001), "Ocean's Twelve" (2004) and "Ocean's Thirteen" (2007).  His first leading role was in Steve Buscemi's independent comedy-drama "Lonesome Jim" (2006).

I'm Still Here (2010 film): I'm Still Here is a 2010 American mockumentary comedy-drama film directed by Casey Affleck, and written by Affleck and Joaquin Phoenix.  The film purports to follow the life of Phoenix, from the announcement of his retirement from acting, through his transition into a career as a hip hop artist.  Filming officially began on January 16, 2009 at a Las Vegas nightclub.  Throughout the filming period, Phoenix remained in character for public appearances, giving many the impression that he was genuinely pursuing a new career.

Big Blue Marble: Big Blue Marble was a half-hour children's television series that ran from 1974 to 1983 on numerous syndicated and PBS TV stations.

Bill Sweetman: Bill Sweetman (born 1956) is a former editor for Jane's and currently an editor for Aviation Week group.  He is a writer of more than 50 books on military aircraft.  He lives in Oakdale, Minnesota.  He is noted for his dogged pursuit of the Aurora project.  He appeared as an Aerospace Consultant on in the Nova PBS TV program "Battle of the X-Planes" about the Joint Strike Fighter Program.

Out of Our Father's House: Out of Our Father's House is an episode of PBS's Great Performances series.  This episode was first broadcast on 2 August 1978 on PBS.  The movie is a televised play of the work by Eve Merriam.  The play is about six real-life leaders of the women's suffrage movement.  The TV movie stars Jackie Burroughs as astronomer Maria Mitchell, Carol Kane as Eliza Southgate, Dianne Wiest as author Elizabeth Gertrude Stern, Maureen Anderman as Doctor Anna Howard Shaw, Kaiulani Lee as Elizabeth Cady Stanton, and Jan Miner as "Mother" Mary Jones (full name Mary Harris Jones).

Realidades (TV series): Realidades was a PBS TV series of 30 minute documentary and arts programming on WNET Channel 13 New York from 1975-1977.  Willie Colón was music director of the series and recorded the theme tunes on his 1975 album "The Good, the Bad, the Ugly".

Conrad Tao: Conrad Yiwen Tao (born June 11, 1994) is an American composer and pianist and former violinist.  Tao's piano and violin performances since childhood brought him early recognition at music festivals and competitions, and he is receiving critical praise for his recitals and concerts with symphony orchestras.  At age 13, he was featured on the PBS TV series "From the Top – Live from Carnegie Hall" as violinist, pianist and composer.  Critics have found promise in his early compositions, and he won eight consecutive ASCAP Morton Gould Young Composer Awards.  Dallas Symphony Orchestra commissioned and premiered, in 2013, an orchestral work by Tao, to observe the 50th anniversary of the assassination of John F. Kennedy, and Tao continues to produce new compositions.

Norman Adler: Norman Tenner Adler (June 7, 1941 - September 11, 2016) through his research, teaching, writing, and academic administration, made major contributions to the modern study of biological psychology and in American higher education, having helped develop the fields that are now labeled behavioral neurobiology and evolutionary psychology.  One of Adler's prominent experiment included an in depth analysis of mating performance of male rats and its relation to fertilization in the female, which led him to observe how behaviour could affect reproduction in species.  With his students and colleagues, he has worked at the interface between biology and behavior.  They have stressed the importance of combining the study of physiological mechanisms controlling behavior with the functional/adaptive significance of behavior in an evolutionary context.  He was influenced in this approach by his undergraduate teachers at Harvard, especially Paul Rozin, Jerry Hogan, and Gordon Bermant, and his student colleagues like Don Pfaff with whom he has maintained scientific relationships over the years.  His research was also impacted by Daniel Lehrman, and he worked closely with Lehrman's student, Barry Komisaruk, on hormones and neural functioning.  Adler is also a prominent figure in American higher education, especially the role of behavioral neuroscience in liberal arts education and religion in the college classroom.  He participated in Phillip Zimbardo's PBS TV series Discovering Psychology, one of the first distance-learning courses in psychology.

Daniel Brochu: Daniel Brochu is a Canadian voice actor born in Montreal, well known for voicing Buster Baxter in the PBS TV series "Arthur" and its spin-off "Postcards from Buster", as well as Danny Pickett in later seasons of "What's with Andy? ".

Explore (TV series): Explore was a 1980s PBS TV show based upon the film footage filmed by explorer Douchan Gersi over the previous 20 years.  The show was hosted by popular actor James Coburn.

Supporting paragraphs: I'm Still Here (2010 film) Casey Affleck
Answer: "Lemon Sky"