Solar Sparkleball!

Step 4 Second layer

Using the clothes pins,  space 9 cups on top of  and around the 12-cup ring.  (The photo shows the second layer in blue cups just to be easier to follow.)  Again, scatter cups with holes equally around the ring.  Solder the nine cups, at their bases,  to each other and to the First Layer.   You should see the ball-half forming, like a dome.