KirriCorp

Just got bored. Then after random surf inspired by some riddle:
1. What has 6 faces and 21 eyes?
2. What has 4 legs can stand but cannot walk?
3. What has bought but not used by the buyer. And those who use didn't know that has used it?

Add more xD
4. What has sphere shape (think of 3d circle or egg or ball) that cannot roll?
5. What has been always seen but ignored by us (human)?