Door to the FutureTo create great inventions, you need time to concentrate. Hang this sign on your doorknob so everyone will know you are busy working on important new inventions. Directions: 1. Ask an adult to help you cut out the doorknob sign along the dotted lines. 2. Write your name on the first blank line on the sign. (If you use a crayon, you can wipe off your name afterward, and rewrite it again later.) 3. Fill in the second blank line with the name (or picture, or sticker) of your invention. 4.Create your own invention—in peace and quiet!