Possible Clues:

• Sudden shining
• Sudden effect of a cloud passing
• Polish students upset, with 25% of students supporting light explosion
• Sudden light shining through the clouds
• Paper goes bankrupt over writing emerging luminously from The Cloud
• A guitar body finish, an orange-yellow centre fading to a black edge
• Sudden light seen through the clouds
• Radial design
• Rayed ornamental design