'Thirty spokes meet in the hub.
but the empty space between them is the essence of the wheel.
Pots are formed from clay,
but the empty space within it is the essence of the pot.
Walls with windows arid doors form the house,
but the empty space within it is the essence of the
Matter represents the usefulness
Non-matter the essence of things.'
Adnan Kahveci, Şenol Aykaç, Ceyda Sütemen, Mehmet Emin Sarıhan, Arzu Azın, Berfin Yıldız, Elif Onat
Xavi Bou captures the invisible flight patterns of birds http://www.xavibou.com/index.php/project/ornitographies/
Example kinematic traces for takeoff, mid-flight and landing