In 2013 Allen identified a previously unknown tarot deck within the museum's collections hand-painted c.1906 by the English artist and mystic Austin Osman Spare. He subsequently edited the first critical survey of Spare's cards.
In 2013, Allen recognized an unknown tarot deck within the museum's holdings that Austin Osman Spare had hand-painted around 1906. He then compiled the first critical examination of Spare's cards.