When it ripples or when it's interacting with the world around you it's obvious and you'll get ripples. The surface ripples are what you're commonly aware of. When you think, hear, speak, cry out, engage in something physical or stressful the waves are produced.
With meditation that all stops. Your brain may be totally still, not moving. It's really possible. When the surface of the brain quiets and becomes still we begin to see and feel what is underneath. We wouldn't know there's anything much underneath our consciousness except what we may see from the surface. Release whatever expectations about what will occur as you meditate. Don't think that you'll have some experience of nirvana...Heaven. Don't think that you'll have a void mind. Don't think that you'll stop thought today. Don't think anything. If you're attached in anyhow to the thought that you're going to "acquire" something from sitting now, let it go. If you're concerned about getting something each time or whatever time you meditate you'll be frustrated. If you're frustrated you'll not continue. Read more by downloading this book!