Phosphenes

Complementary colors lie opposite one another on the spectrum. For example, red complements blue, yellow complements violet.

When complementary colors are placed in close proximity, it is apt to cause conflict and disturb the eyes. Used subtly, it can make our eyes dance to a discordant tun...

..that is generated by the bolt of lightning is due to the extreme heat produced, causing the air to super-heat and expand. The resulting sonic wave is heard in a 25-mile radius. Light and sound always go together, with the sound following the light.

Another place to put your attention is the light all around you. Just keep your eyes on one spot, and notice the light in the room you’re in. Another day, just focus on noticing sounds or energy.