Is the Observable Universe Truly Spherical_ Or Is That Just an Illusion

The observable universe is commonly described as a spherical region centered on the observer, defined by the maximum distance from which light has had sufficient time to reach us since the beginning of cosmic expansion. However, this seemingly simple geometric picture raises an important question: does the observable universe possess an intrinsically spherical structure, or is its apparent shape a consequence of observational limitations and cosmic perspective? This article examines the foundations of the spherical-universe assumption and explores how gravitational lensing, large-scale cosmic structures, dark matter distributions, cosmic voids, and spacetime curvature may influence our perception of the universe's geometry. By analyzing the role of light propagation through an inhomogeneous cosmos, the discussion highlights the distinction between the observable horizon and the underlying physical structure of the universe. The article further considers how future observational missions and cosmological surveys may provide deeper insights into potential anisotropies and distortions in the observable universe. Through an accessible yet scientifically grounded approach, it encourages critical examination of one of cosmology's most familiar assumptions while emphasizing the challenges involved in inferring the true geometry of the cosmos from observations made within it.