Ebert argues that reality is subjective and truth depends on human interpretation since people have different perspectives. This does not apply to mathematics which has objective answers. Perception can influence how we see reality, so we cannot fully believe what we see or agree on events since our memories may be flawed. For example, in Plato's Allegory of the Cave, those chained see the cave as reality while outsiders see more. Ebert analyzed the film Rashomon, noting that cameras record what they see but people think what they see is the only reality. Therefore, the document agrees with Ebert that truth is shaped by individual perception so reality is subjective.