ER - Existence, Reality and Time

What if time is not a problem to be solved, but the very condition that makes existence possible?

ER: Existence, Reality and Time continues and deepens the journey that began with Time Explained. While Time Explained was written as an accessible entry point, this book is an in‑depth exploration of Existential Realism (ER) for readers who want to go further.

If you already read Time Explained, this book is the next step. It sharpens the arguments, expands the examples, and follows the consequences of ER much further—across physics, philosophy, cognitive science, and lived experience.

This is not dry, abstract philosophy. It is an interdisciplinary investigation that connects scientific models, human experience, and metaphysical clarity. Newcomers to theories of time may want to start with Time Explained first; ER is written for readers ready to engage more deeply.

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Which Book Should You Start With?

Two books, two entry points — one shared framework.

Time Explained is the place to begin if you are new to philosophical and scientific debates about time. It offers a clear, accessible overview and introduces Existential Realism without requiring prior background. It is written to re‑orient intuition and open the problem space.

ER: Existence, Reality and Time is the continuation. It is a sustained, in‑depth investigation for readers who want to follow the arguments further, explore their consequences, and engage more rigorously with physics, philosophy, and cognition.

If Time Explained opened the door, ER invites you to walk through it.

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Why Time Remains So Difficult to Understand

We measure time constantly, but that does not mean we already understand what time is.

Clocks measure duration and change. Calendars organize events. Physical models describe temporal relations with remarkable precision. None of this, however, automatically tells us what past, present, and future are ontologically.

Part of the difficulty arises because several distinct levels are often conflated:

Physics describes measurable structures and processes.
Philosophy asks what those structures imply about reality.
Cognitive science examines how the brain represents past and future.
Personal experience confronts us with change, memory, anticipation, and impermanence.

ER: Existence, Reality and Time examines these levels together without treating them as identical. The book asks not only how time is measured or experienced, but what structure of reality might underlie these different perspectives. At its centre is not a final theory of everything, but a precise starting claim: Only the present exists. Yet reality also includes past facts and future possibilities.

Presentism — The Intuition of a Solely Existing Present

Presentism preserves the special status of the now, but often restricts reality to what is present.

At its core, presentism holds that only present objects and events exist. The past and future therefore do not belong to the current ontology. This view reflects the familiar experience that the past is over and the future has not yet occurred.

Where Presentism Faces Difficulties

The main difficulty arises when the non-existence of past and future is taken to imply that only the present is real.

The theory must then explain:

what grounds true statements about past events,
how past causes determine present conditions,
how relations across time should be understood,
why future possibilities can be objectively relevant.

Presentists have developed several responses to these problems. ER adopts a different starting point: it retains the claim that only the present exists while separating it from the broader question of what is real. The past therefore need not continue existing in order to remain part of reality. Likewise, the future can remain open without being reduced to mere imagination.

Eternalism — A Common Interpretation of Modern Physics

Past, present, and future are treated as equally existing parts of four-dimensional spacetime.

Eternalism treats temporal events in a manner similar to spatial locations. An event may be past or future and still belong tenselessly to spacetime. The present usually has no unique ontological status; it marks the temporal position of an observer.

Questions Raised by Eternalism

Eternalism provides a unified account of temporal relations and is often associated with the spacetime structure of relativity. Yet the mathematical representation of events at different times does not by itself establish that all times exist in the same way.

The central philosophical question is therefore: Does a four-dimensional model merely describe the temporal structure of the world, or does it also prove that past, present, and future exist equally?

ER rejects this automatic transition from mathematical representation to ontology. It treats past facts and future possibilities as real without regarding them as equally existing regions of a completed temporal block. This leaves room for a present in which something genuinely new occurs, rather than treating becoming solely as a perspective within an already complete spacetime.

Existential Realism — A Different Starting Point

ER distinguishes what presently exists from the broader domain of what is real.

Existential Realism begins with a simple but fundamental distinction: existence and reality are not the same. According to ER, only present objects, events, and processes exist. The past no longer exists, but it remains real as what actually happened. The future does not yet exist; what is real are the possibilities opened and constrained by present conditions.

What ER Does Differently

ER preserves the special status of the present without reducing reality to whatever is immediately present. It therefore combines three insights:

The past has happened and is settled.
The present is where concrete existence and actual change occur.
The future is open, but not arbitrary.

Within this framework, change is not merely a shift in perspective across already existing events. Possibilities are actualized in the present, and new facts enter the history of the world. ER is not intended to replace physics or cognitive science. It brings insights from physics, phenomenology, and cognitive science into a shared philosophical framework and asks which ontology of time is compatible with them. ER: Existence, Reality and Time develops this approach systematically and examines its consequences for time, causation, memory, possibility, matter, and human experience.