I love discovering an artist. Thank goodness for the internet and it's endless resources. The first picture that I stumbled on was the bike tires, titled "samelight". Following the rings while suspended mid movement. These works are by San Francisco based Katina Huston, and they are called shadow drawings. Aren't they lovely. She has a series, not shown, of brass instruments as well. They are just fantastic, slowly drawing you in, and following the sequence of movement.
Find more at Katina Huston