...'Magic box' was designed and printed by Benita Spronk and Rosemarijn van Limburg Stirum. It was printed on Biotop paper on an Asbern press and consists of 150 copies, numbered and signed. 20 copies are marked in roman numerals. [XIX/XX, Gesigneerd door Rosemarijn van Limburg Stirum en Benita Spronk]. De Zwaluw...Delft...Zwaluw X.