A 3-D Map of the three closest canyons to our home. The left hand page is a topographical map of one of the areas in one of the three canyons and the right hand side is an aerial photograph of the same area. Both sides are 3-D.
(Funny thing: we both had to wear our reading glasses underneath the 3-D glasses.)
The NVO will be busy all day with this activity. ;-)
Thank you "K" for the fantastic recommendation.