the project to start with a blank stage.
to do this, click on the pen menu and use the clear block.
place the clear block right under the when flag clicked block so that the screen is cleared as soon as the project is started.
each time the flag is clicked, the screen clears and a new set of colorful objects is stamped.
but, you might want to add more objects to fill up the space on the screen, so tinker with the value in the repeat block until you find one you like.
changing the repeat number will change the number of times the blocks and side to repeat loop are run and the 