Gakken's "First Discovery Exploration Light Series" Dinosaur Exploration Body Exploration Space Exploration Night Creatures Exploration Cave Exploration Night Construction Site Exploration Wizard and Ghost Exploration Christmas Exploration Ancient Egypt Exploration Paris Exploration These are picture books with a special feature: by inserting the included "Exploration Light" into the pages, hidden pictures and text appear. There are various themes such as "Night Construction Site Exploration," "Body Exploration," "Cave Exploration," "Night Creatures Exploration," "Ancient Egypt Exploration," "Space Exploration," and "Christmas Exploration." The price was 1,980 yen (including tax) per book! Designed to stimulate children's curiosity and allow them to learn while having fun. I enjoyed them very much, so the light compartment on the back cover and the lights themselves have a lot of damage. Other than that, I don't think there's much damage, but these are books I've loved for many years. Please understand that these are used items. You can make a light by color-copying and laminating it, so if you'd like, I can offer one book without a light. Thank you!