Interactive creation (create unconventional polygons) & Booleans - difference (cut A out off B) & Mirror (for geometrical items) which can be very useful when modelling.
seen from Netherlands

seen from Netherlands

seen from Namibia
seen from Canada
seen from China
seen from China
seen from Japan
seen from Yemen

seen from T1

seen from United States
seen from Russia
seen from Kenya
seen from United States

seen from United States

seen from Portugal
seen from Malaysia

seen from United States

seen from United Kingdom
seen from China
seen from United States
Interactive creation (create unconventional polygons) & Booleans - difference (cut A out off B) & Mirror (for geometrical items) which can be very useful when modelling.