






Robbert Dijkgraaf inaugurates the first wall formula (Nov. 2015) 

Einstein's gravitational formula, on the wall of museum Boerhaave 

The crossing on Hogewoerd, with Snell's law in the distance 

Snell's law, inaugurated November 2016 

Lorentz force formula, opposite Lorentz's house on Hooigracht 









The Lorentz force formula, inaugurated November 2016 

The Lorentz force formula, on the wall of Cafe de Hooikist 

Lorentz contraction, railway crossing Morsweg/Haagweg, 2017 


The contraction effect can be viewed from a train 







Oort constants, facing the Observatory (2017) 

Uhlenbeck and Goudsmit's electron spin (Gerecht, 2017) 

SenseJan and Ivo, designing the next wall formula 

