According to Official Guinness Records,
The largest easel is 17.22 m (56ft 6 in) tall and 9.45 m (31 ft) wide. It was made by Rajasekharan Parameswaran of Meenachal, Tamilnady, India, and was measured on 19 April 2008.
For a complete list of 2008 records, please visit 2008 Guinness Records in India.