In the poem 'Photograph', the sea represents timelessness. The poet says that the sea '... appears to have changed less'. The sea is an element of nature where time has little or almost no influence.

The lesson draws a picture of the lives of people who spend their time at sea.

Challenging Lifestyle:
Living at sea is a challenging lifestyle that is not for everyone. People who choose to live at sea must be prepared for long periods of time away from their families and loved ones. They must also be prepared for the unpredictable nature of the ocean, which can be both beautiful and dangerous.

Work and Routine:
Life at sea is also characterized by a strict routine. People who work on ships or other vessels have to follow a schedule that dictates when they work, eat, and sleep. They must also be prepared to work long hours and be on call at all times.

Teamwork and Camaraderie:
One of the most important aspects of life at sea is teamwork and camaraderie. People who live and work on ships must learn to rely on each other and work together to accomplish their goals. This sense of community is strengthened by the fact that people at sea often share living quarters and must learn to live in close proximity to each other.

Connection to the Environment:
Despite the challenges of life at sea, many people find it to be a rewarding and fulfilling lifestyle. People who live at sea often have a deep connection to the ocean and the natural environment. They are also often able to witness the beauty of the natural world in a way that is not possible on land.

In summary, the lesson draws a picture of the lives of people who spend their time at sea as a challenging but rewarding lifestyle that requires discipline, teamwork, and a deep connection to the natural environment.