Concept:
Colour psychology and light reflection play an important role in interior perception. Dark colours absorb more light, affecting how spacious a room feels.
Explanation:
Dark colours absorb light instead of reflecting it.
This reduces brightness and creates a sense of enclosure.
As a result, rooms painted in dark colours tend to feel smaller and more confined.
Light colours, on the other hand, reflect more light and make spaces appear larger and brighter.
Hence, a room painted with a dark colour will appear smaller than its original size.
Final Answer: \(\boxed{\text{Room will appear smaller than the original room size}}\)