Explosion Birthday Box

Our grandson is having his 7th birthday soon but we won't be able to visit on his day but we were able to visit this past week.  I had made him an explosion box for his birthday and I wanted to see his reaction.  I think he enjoyed finding his "treasure".  He will have other gifts to open on his birthday.  He is a sweetheart and so smart.  He invents interesting creations out of ordinary objects.  Maybe he will be an engineer when he grows up.