Reality Key Keychain Cobalt MoMA Design Store Purchased from the MoMA official website, but selling because the size didn't suit me. It would be cute as a bag charm or a key holder. It's a good deal since you'd have to pay for shipping on the official website! Reality Key Keychain Cobalt A silicone keychain modeled after an Italian church key from around the 18th century. This item is characterized by its large size, approximately 17cm in length, and its striking color.