Earlier today, we told you about plans to create a whimsical temporary event space in the form of a massive bubble through and around the donut hole-like center of the Hirshhorn Museum and Sculpture Garden. Since then, we’ve managed to obtain some more images of the proposed design, which has been conceived by New York architecture firm Diller Scofidio + Renfro. The firm has been involved in the design of several high profile cultural institutions,…