By the time bidding closed Tuesday, there was no lack of companies competing to build the wall President Trump has proposed for the border between the U.S. and Mexico. In fact, by The Associated Press’ count, upwards of 200 organizations had expressed interest in designing and building it for Customs and Border Protection.

Despite their common goal, the companies submitting bids have followed some radically different paths in their approach.

Among the submissions are walls with solar panels, wire mesh and sloped, slippery surfaces. There are even walls that are no walls at all — statements standing instead as protests of a policy that from the start has drawn a lot of resistance.

As NPR’s Richard Gonzales reports, the CBP plans to announce the finalists for the contract in June, at which point the companies still in the running would be expected to build a prototype roughly 30 feet long and anywhere from 18 to 30 feet tall. The AP notes the prototypes are expected to cost about $200,000 to $500,000 each; estimates for the cost of the wall covering the 2,000-mile border, however, range up to $38 billion.

Here’s a glimpse of just a few of the designs vying to stand between the U.S. and Mexico, complete with renderings and explanations of how they could take shape. SEE THE PHOTOS, FEATURING WIREWALL®, HERE