Our Selection Criteria:

1. significant impact on geographical knowledge: advanced geographical theory or practice
2. abstract visualisation with core spatial element (could be conceptual or data driven), including maps, charts, diagrams, graphs. (Generally excludes other visual media - paintings, photographs, etc.)
3. widely recognised amongst peers as a 'classic'
4. produced in last 120 or so years (taking 1887 appointment of Mackinder at Oxford as start of academic geography discipline)

Defining a 'classic':

• easily recognised,
• wide impact, (crosses over domain, influence beyond disciplines)
• longevity, enduring value (timelessness?)
  
• originality ('breaks mould')
• cited and copied
• elogance, simplicity and self explanatory
• universality?
• ???