My Estonian is nonexistent and Google Translate is of little help. I believe it was designed by Ann Lumiste. Others who may or may not have been involved in bringing this beast to life include Ita Ever, Helle-Reet Helenurm, Rein Oja and Andres Jõerand.
Edit: Are they referring to this thing as the "Draamateatri" (Drama Theater), hence the "D" badge on the nose?