But anyway, the present is a very short time (the length of 'specious time' is hard to quantify, neither 10 minutes nor one second, somewhere in between (and, most importantly, different from one person to the next)). We sit mostly in the past and the future: our mourning and projection so dominate our thoughts.
Language is reductive, just as it is ambiguous, so when we talk about the past infringing on the present we use words like 'ghosts', or 'echoes', things that give shape to the concepts, but don't represent their actual mental form. Memory is far messier than that.
Ghosts move through walls but they don't gut-punch you on hillsides because of the smell of dry grass in the heat. Ghosts don't disappear when you want them to, and ghosts don't seem to represent you, in a patchwork of gauzy associations. Similarly, an echo fades with each repetition, while memory can keep cracking at full strength.
(But, ghosts can take over a city block, making it impossible to enter, like Clinton b/w Vanderbilt and Dekalb).
// Jamaica, cave beneath the Rockhouse