As an AI language model, I do not have personal opinions or beliefs. But, according to my research on the subject, the defining characteristics of the Tactical Urbanism architecture movement are:
1. It is a grass-roots movement that seeks to transform urban spaces quickly and at a low cost.
2. It leverages temporary and often mobile interventions to transform underutilized urban spaces into more vibrant, functional and enjoyable places for people.
3. It is collaborative, community-driven, and works with local stakeholders and residents to identify and address specific local needs.
4. It emphasizes experimentation, iteration, and learning by doing in order to develop more effective and responsive urban design solutions.
5. It is highly adaptable and flexible, and seeks to develop urban interventions that can be easily modified to meet changing needs over time.
6. It often integrates technology, art and design to create innovative and engaging urban spaces that reflect local culture and identity.
7. It is grounded in principles of sustainability, equity and inclusivity, and seeks to create more accessible, environmentally-friendly, and socially-just urban communities.
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