Vertical Farming - crops are grown on top of each other not in horizontal rows

Vertical farming is where crops are grown on top of each other than in traditional horizontal rows. This is happening both on the land ( indoors) and in the sea.
Using less space the yield is higher.

Read description and look at the two pictures.

Greenwave have developed a sustainable agriculture technique called vertical underwater farming or regenerative ocean farming.The company is growing a range of seaweed types like kelp and shellfish, plus mussels and scallops on a rope scaffolding system under the sea.

Kelp is one of the fastest growing organisms on the planet and can be repeatedly harvested for at least seven years.
Source
World Economic Forum