There are some shots of those near the tail end of the article. Both pure cylinders (https://c6.staticflickr.com/9/8240/8661684397_3e2953b2ca_b.jpg https://c6.s

There are some shots of those near the tail end of the article. Both pure cylinders (https://c6.staticflickr.com/9/8240/8661684397_3e2953b2ca_b.jpg https://c6.staticflickr.com/9/8240/8661684397_3e2953b2ca_b.j...) and capped columns (https://c8.staticflickr.com/6/5613/29417525663_448be7dac8_o.jpg https://c8.staticflickr.com/6/5613/29417525663_448be7dac8_o....).