Bohr’s explanation of the slipperiness of quantum attributes is that such attributes do not belong to the quon itself but reside in “the entire measurement situation”—a phrase Bohr was particularly fond of. When we measure a certain attribute, we should not imagine that the electron actually possesses this attribute. Electrons possess no attributes of their own. An electron’s so-called attributes are really relations between the electron and its measuring device and do not properly belong to either.
