I get rid of border front and back.
The present constantly progress towards the future and time(space) never stays. However, the space(time) of the past stays in our memories. By experience, time is overlapped in memories of spaces collected subjectively. Therefore even though one's private area overlaps in the same area, the memories of time length and image of that space differs. Not only the visual elements of the physical area but non visual elements are remembered as same.
In space of reminiscing the past, visual information is not prioritized compared to the space we share today.
Rather than visual, a specific incident, followed by feelings of that time, the temperature of relationships between others, those became mixed and comes to one's mind. Visual information may be ignored or may stand out depending on what you prioritize. However, the author consider physical space broken down by time, and tries to focus on non visual elements.
In the current time, the visibility of space is overwhelming and non-visual elements like temperature, smell, relationship, and feelings are invisible. The space of reminisce originated from current time is same as a virtual space of reality, so it emerges from invisible elements from the current era, and is also a private area that others and time can't interfere.
Whether you observe it or not usually, a space of reminisce can give great comfort to individuals and has a influence to present and the future.
To express this space we covered the physical elements on the screen with thin paint and reorganized the screen with color and light. Humans recognize color with not only visually, but with the whole body. As memory is stimulated via flavor and smell, color can be a medium recalling the future. By color, one can recognize the space and time once only inside one's mind, and make a screen of space by light.
To picture the perspective of the physical space, we use diagonals, but in the space of memories, the ambiguous boundary(a different boundary) that color and color overlaps make the depth of the screen.
Like today when past and the future is packed together like a far-off horizon, we haven't set boundaries, and open the start and the end. Therefore to feel the size of the space, what to find inside is up to the individuals. Color and light bear each other, and stay on screen like a winter's lake.