Israelis were not allowed to light traditional bonfires on Lag B’Omer (33rd day of the Omer), but the Tel Aviv sky was lit up by 36 illuminated drones. They were synchronized to display images of a bonfire, bows and arrows, the Hebrew for the number 33, Sameach (joy) and more.

https://www.youtube.com/watch?v=vYExgLX5bOw