Here are my observations after looking through the cardboard tube with different sized holes at one end:
• Colors appeared more vibrant and saturated. Bright colors seemed almost neon in intensity.
• Colors appeared more separated and distinct. Shades seemed more differentiated. Subtle gradients were exaggerated.
• Shadows and highlights within colors were emphasized. Details within colors became more visible.
• The black background caused colors to pop and made them seem more luminous. Colors glowed against the black.
• Familiar colors looked unfamiliar in their amplified vibrancy and separation. Muted colors became bold. Pastel colors were vivid.
• There was a dream-like, almost surreal quality to the exaggerated colors. A strange, unfamiliar palette emerged.
• Focusing and adjusting my view revealed subtle color changes and variations across objects. New color patterns emerged.
• Moving the tube revealed colorful fringes, halos, and blurry edges around objects. Colors seemed to slide across edges.
• The effect made me see colors in a more mindful, contemplative way. I noticed colors more consciously. Familiar colors became fascinating.
• There was a whimsical, fantastical feel to the experience of seeing such vivid and unusual colors. An imaginative, almost non-logical aspect emerged.
Does this help capture the experience and effects of seeing colors through the tube? Let me know if any additional details would be helpful. I can provide more observations and descriptions.