Furniture arrangement doubles the space!
How does furniture help double the space ? First you should understand the core concepts of storage organization:
[ Space is a resource
]
Optimize storage space: Furniture pieces can double up as storage units. Try to take advantage of vertical and corner spaces, such as walls, behind doors, and under stairs.
Source: studiofalu.com
"One area, one function" principle: In terms of storage, mixed uses have to be avoided to ensure that each area has a clear storage location. Organizing products can improve space utilization. Good organizers include shelf risers, two-tiered Lazy Susans, stackable plastic drawers and slim hangers. Mastering the art of clothing folding can also help maximize space.
Source: pinterest.com/simplyorganizeddk
[ People-oriented
]
Emphasize the personality and habits of family members to determine the use of space. For example, the storage of children's rooms should be guided by the autonomy of children rather than enforcing adult standards.
Source: mukuri.themedia.jp
Sentimental storage: Keep items of commemorative value, but avoid hoarding (such as keeping only one box of nostalgic items).
Source: deontwerpboer.nl/project-leeuwarden
Well, let's see which "tools" are appropriate and how to use them:
[Small and variable size]
Small, portable, stackable, integrable or foldable furniture can save space and allow you to plan your space flexibly. Leaving enough space between furniture will allow for more walkways and make the room look more spacious. 
Source: yankodesign.com
[Dynamic Storage]
Flexible storage solutions: for example, using multifunctional furniture and modular storage units. They can be adjusted to meet different needs, making living space more diverse to respond changes in family structure and activities.
Source: www.yumu.tw/
[Visual Decluttering]
A light-colored room looks spacious. White surfaces bounce light around the room, making the space feel bright and open. Too many colors & prints can create clutter. When decorating a small space, focus on subtler details like texture and minimize distractions like color and pattern.
Source: www.yinjispace.com/article/KINJO-Design-Habitat.html
Decorations can store items and hide clutter, but too many decorations will lose the beauty. We should carefully select a small number of decorations for a small room. Anything that blocks the eye’s movement across the room is considered a visual boundary. When using furniture to divide different spaces, remember to keep it visually bright. 
Source: shexiadesign.com
Creating an accent wall or emphasizing vertical elements can give a room the illusion of elongation. Vertical element could be a narrow floor-to-ceiling bookcase. Lightweight curtains that hang from ceiling to floor are also effective.
Source: shexiadesign.com 
Choose furniture with rounded, soft elements so that there are no hard corners that hinder the visual flow through the space, and soft edges make the room go from cramped to cozy. 
Source: deontwerpboer.nl/project-leeuwarden Mirrors can trick our eyes and make a room feel larger than it actually is as we perceive the reflection as an increase in the volume of the room.
Source: urbanologydesigns.com
Summary
Through the systematic design of "classification logic → space planning → tool enhancement → habit maintenance", storage can be transformed into a continuously operating home ecology rather than a one-time sorting task. The key is to dynamically adjust according to the life pattern so that items can naturally "flow" to the most suitable location.
