Dreams and visions about closed sea shells tell you about security and safety, but you don't show your true self or your feelings; so you are blind in your confidence to the outside.
The pleasant events in your life will lead to repentance and bad memories. An alternative explanation is that you try to protect yourself from pain, you close your heart, your true self emotionally. Another explanation is that the sea shell represents the womb of life; the connection with the universe, water and deep healing of all inner experiences and wounds from your past, past life and not to forget from the now.
An alternative explanation is that the sea shells are a signal to a life on or around the sea or a soul mission that has to do with water. But it can also refer to a mermaid, merman souls mission and connection.
An open sea shell that you find in your dream or vision is a very positive message: you have found treasure with regard to your true heart! It is success, happiness, wealth, golden hands and inner wisdom that can bring you to something beautiful.
Walking past shells and collecting them in your dream or vision tells you about extravagance and taking a risk in your life, which may well lead to something beautiful, but it can also make you feel bad.
Finding two sea shells in your dream or vision tells you about your feminine and masculine energy that is in balance. You find the balance between your male and female side; between your introvert and extrovert side, or your passive and active part, positive energy and negative energy etc. Another explanation is to find a partner and a twin soul of your life phase.
Three sea shells in your dream or vision tells you about the power of three, three times you get back what you have given. The connection with the universe and the afterlife. Spiritual growth and healing come your way. You are fully supported and you are entering a new phase of life.