The umulius rectangulum is a geometric form which is characterized by having 3 "rings" which are locked together. However, if any one of the pieces is removed, the other the other two simply fall (or can easily be pulled) apart. The model is made from 6 identical units. A umulius can also be made from 3 paperclips.
Sunday, June 21, 2015, 3:15 pm – 5:15 pm EDT