Every night Canary Wharf Middle Dock has a  flotilla of miniature paper boats by Aether and Hemera crossing it.

Best of all, you can influence their shape, form and luminescence with your mobile. 

Free, daily, until Feb 15, dusk-2am Canary Wharf, E14 4HJ 
Tube | Canary Wharf  
canarywharf.com

Image: YouTube