Interesting and innovative work from bike designers Paul Harder Cohen and Mette Walsted, using wood and carbon fiber (I'm not interested in a 'steel is real' flamewar). This BBC podcast has some great interviews.

https://www.bbc.co.uk/programmes/w3csz1yp

Their website has some great pics.

https://www.cohandco.com/

No, I'm not trying to sell the bikes, I just found them very interesting and thought I would share.