President Brigham Young related the circumstances of their seeing a Circle of about 40 persons dressed in white robes & caps in the upper Story of the Temple in kirtland during the spring of 1835 after the Endowments. Their was no person in that room at the time that was mortal yet the room was filled with light & many personages did appear Clothed in white & freequently went to the windows and looked out So that the Brethren in the street Could see them plainly. Brother Young & Truman Angel stood to gether in the street & looked at them a long time. W W Phelps says he saw them for 3 hours. They were visable by all the Brethren Present. Brother Angel said they must have stood some 2 feet from the floor if they were ownly the size of common men they Could not have been seen from the place whare they stood except it should be the head & those personages appeared nearly down to the waist as they looked out of the window with a front view.
[Source: Wilford Woodruff's Journal: 1833-1898 Typescript, Volumes 1-9, Edited by Scott G. Kenney, Signature Books 1993, http://amzn.to/newmormonstudies]