It is important to note, however, that the extra dimension, though curled up, was still Euclidean in nature. Basically, the fifth coordinate was not observable but was a physical quantity that was conjugate to the electrical charge.
Mahalaga na tandaan, gayunman, na sa sobrang laki, kahit kulutin up, ay pa rin Euclidean sa kalikasan. Basically, ang ikalima pag-ugnay ay hindi kapuna-puna ngunit ay isang pisikal na dami na ibanghay sa elektrikal bayad.