Knowledge occupancy

Four quadrants of knowledge in descending order of occupancy in human mind :

• Things that you don't know 'that you don't know' (99.99999%)

Rest 0.000001 % is occupied by below 3 =>

• Things that you know 'that you know',
• Things that you know 'that you don't know' and
• Things that you don't know 'that you know'