The tapetum is not a part of human eyes, but cows' eyes, cats' eyes and other animals' eyes do have tapetums. What does the tapetum do? Why don't humans have them? What happens from the time light hits an object to after the brain forms a picture...
you’ll need to find a suitable evergreen tree, or a bush. If this isn’t possible for some reason, then bring your own leafy plant outside with you. (Don’t forget to bring it back inside after!)