http://pbskids.org/designsquad/build/triangle-pop-card/ Get creative with paper engineering and delight your friends and family with cards that work in surprising ways. Triangle Pop-Up Card: http://pbskids.org/designsquad/build/triangle-pop-card/ Floating Box Pop-Up Card: http://pbskids.org/designsquad/build/floating-box-pop-card/ Box Pop-Up Card: http://pbskids.org/designsquad/build/box-pop-card/