Myself and several others were enjoying the beach when these unknown objects kept appearing and reappearing with no sound, almost as if fading in and out from another dimension or cloaking or optical illusions. not sure if it was military or not. it did not apear to be any aircraft i am familiar with but who knows. i just know i am unable to define what we all saw. we are near the snohomish county/paine field airport and near everett navy base.