Smartivity Periscope 3D Wooden Model Engineering Stem Building Set For Kids Ages 6 And UpBuild Your Own Fully Functioning Smartivity Periscope With Multiple Mechanical Action Based Dynamic Gameplays That Introduces Kids To The Principles Of Optics. Assemble The Engineered Wooden Pieces, Bands, Lever, Mirror, And Other Parts Using The Detailed, Easy To Understand, Self Paced Instruction Manual With Large, Easy To Follow Pictures. Once It Is Complete, The Periscope Gives Kids The Ability To Look Over, Around, Or Seemingly Through Objects!