Those who have observed an Unidentified Flying Object at close quarters say they will never forget the experience. As you can see from the images below, based on witness reports, there is a good reason for that.

The images below are either modeled to scale or otherwise rendered according to a size and distance compatible with the witness account.

4/14/57 - Multiple independent witnesses, Vins-sur-Caramy, France, 3PM 3D Solid model constructed and rendered with Carrara and Poser
7/13/59 Mrs. Frederick Moreland, Blenheim, NZ, 5:30 AM 3D solid model constructed and rendered with Aladdin 4D version 5 Images processed and composited with ImageFX version 2.6 Light cones painted with TVPaint Picasso Jr. See the Workshop article on the construction of the first image Second image created with Carrara (1/2001) [footnote 1]
9/19/61 Betty and Barney Hill, White Mountains, New Hampshire; after 10PM 3D solid model constructed and rendered with Imagine Version 2 Automobile model from Syndesis 3DRom Landscape constructed and rendered with World Construction Set; processed to evening colors with ImageFX [footnote 2]
9/3/65 Muscarello, Officers Bertrand and Hunt, Exeter, NH, 3AM 3D solid model constructed and rendered with Imagine Version 2 Images processed and composited with Image FX Version 2 Pole and sky painted with TV Paint Picasso Jr. [footnote 3]
11/2/71 Ronald Johnson and family, Delphos, KS, night MPEG animation generated by Aladdin 4D, composited with ImageFX See our recommendations for MPEG players if you need one. [footnote 4]

Footnotes

1. This image is largely historically accurate. However, the witness described the occupants clothing as "shiny", which was not reproduced.

2. Some liberties were taken with this image. The mountain landscape is from Colorado. The automobile is not the correct model or year. The object is shown with one tier of windows but was described with two.

3. This image is quite accurate, except for any impression that the sky is illuminated by moonlight. The moon was not up at the time of the sighting. The artist visited the location of this sighting in the 1980s.

4. This is a work in progress, with collaboration between the author, the primary investigator and the witness.